terraform-provider-vault Add username_template support for mongodbatlas in database_secret_backend

This change adds username_template field to mongodbatlas block in vault_database_secret_backend_connection resource.

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Closes #1240

Release note for CHANGELOG:

Add username_template to vault_database_secret_backend_connection for mongodbatlas block

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccDatabaseSecretBackendConnection'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test $(go list ./...) -v -run=TestAccDatabaseSecretBackendConnection -timeout 20m
?   	github.com/hashicorp/terraform-provider-vault	[no test files]
?   	github.com/hashicorp/terraform-provider-vault/cmd/coverage	[no test files]
?   	github.com/hashicorp/terraform-provider-vault/cmd/generate	[no test files]
testing: warning: no tests to run
PASS
ok  	github.com/hashicorp/terraform-provider-vault/codegen	0.263s [no tests to run]
?   	github.com/hashicorp/terraform-provider-vault/generated	[no test files]
testing: warning: no tests to run
PASS
ok  	github.com/hashicorp/terraform-provider-vault/generated/datasources/transform/decode	0.779s [no tests to run]
testing: warning: no tests to run
PASS
ok  	github.com/hashicorp/terraform-provider-vault/generated/datasources/transform/encode	0.301s [no tests to run]
testing: warning: no tests to run
PASS
ok  	github.com/hashicorp/terraform-provider-vault/generated/resources/transform/alphabet	0.538s [no tests to run]
testing: warning: no tests to run
PASS
ok  	github.com/hashicorp/terraform-provider-vault/generated/resources/transform/role	1.029s [no tests to run]
testing: warning: no tests to run
PASS
ok  	github.com/hashicorp/terraform-provider-vault/generated/resources/transform/template	1.534s [no tests to run]
testing: warning: no tests to run
PASS
ok  	github.com/hashicorp/terraform-provider-vault/generated/resources/transform/transformation	1.287s [no tests to run]
?   	github.com/hashicorp/terraform-provider-vault/helper	[no test files]
?   	github.com/hashicorp/terraform-provider-vault/schema	[no test files]
testing: warning: no tests to run
PASS
ok  	github.com/hashicorp/terraform-provider-vault/util	0.321s [no tests to run]
=== RUN   TestAccDatabaseSecretBackendConnection_import
    resource_database_secret_backend_connection_test.go:20: POSTGRES_URL not set
--- SKIP: TestAccDatabaseSecretBackendConnection_import (0.00s)
=== RUN   TestAccDatabaseSecretBackendConnection_cassandra
    resource_database_secret_backend_connection_test.go:61: CASSANDRA_HOST not set
--- SKIP: TestAccDatabaseSecretBackendConnection_cassandra (0.00s)
=== RUN   TestAccDatabaseSecretBackendConnection_cassandraProtocol
    resource_database_secret_backend_connection_test.go:104: CASSANDRA_HOST not set
--- SKIP: TestAccDatabaseSecretBackendConnection_cassandraProtocol (0.00s)
=== RUN   TestAccDatabaseSecretBackendConnection_influxdb
    resource_database_secret_backend_connection_test.go:147: INFLUXDB_HOST not set
--- SKIP: TestAccDatabaseSecretBackendConnection_influxdb (0.00s)
=== RUN   TestAccDatabaseSecretBackendConnection_mongodbatlas
    resource_database_secret_backend_connection_test.go:189: MONGODB_ATLAS_PUBLIC_KEY not set
--- SKIP: TestAccDatabaseSecretBackendConnection_mongodbatlas (0.00s)
=== RUN   TestAccDatabaseSecretBackendConnection_mongodb
    resource_database_secret_backend_connection_test.go:226: MONGODB_URL not set
--- SKIP: TestAccDatabaseSecretBackendConnection_mongodb (0.00s)
=== RUN   TestAccDatabaseSecretBackendConnection_mssql
    resource_database_secret_backend_connection_test.go:256: MSSQL_URL not set
--- SKIP: TestAccDatabaseSecretBackendConnection_mssql (0.00s)
=== RUN   TestAccDatabaseSecretBackendConnection_mysql
    resource_database_secret_backend_connection_test.go:289: MYSQL_URL not set
--- SKIP: TestAccDatabaseSecretBackendConnection_mysql (0.00s)
=== RUN   TestAccDatabaseSecretBackendConnectionUpdate_mysql
    resource_database_secret_backend_connection_test.go:376: MYSQL_URL not set
--- SKIP: TestAccDatabaseSecretBackendConnectionUpdate_mysql (0.00s)
=== RUN   TestAccDatabaseSecretBackendConnectionTemplatedUpdateExcludePassword_mysql
    resource_database_secret_backend_connection_test.go:429: MYSQL_CONNECTION_URL not set
--- SKIP: TestAccDatabaseSecretBackendConnectionTemplatedUpdateExcludePassword_mysql (0.00s)
=== RUN   TestAccDatabaseSecretBackendConnection_mysql_tls
    resource_database_secret_backend_connection_test.go:512: MYSQL_CA not set
--- SKIP: TestAccDatabaseSecretBackendConnection_mysql_tls (0.00s)
=== RUN   TestAccDatabaseSecretBackendConnection_postgresql
    resource_database_secret_backend_connection_test.go:558: POSTGRES_URL not set
--- SKIP: TestAccDatabaseSecretBackendConnection_postgresql (0.00s)
=== RUN   TestAccDatabaseSecretBackendConnection_elasticsearch
    resource_database_secret_backend_connection_test.go:593: ELASTIC_URL not set
--- SKIP: TestAccDatabaseSecretBackendConnection_elasticsearch (0.00s)
=== RUN   TestAccDatabaseSecretBackendConnection_snowflake
    resource_database_secret_backend_connection_test.go:625: SNOWFLAKE_URL not set
--- SKIP: TestAccDatabaseSecretBackendConnection_snowflake (0.00s)
PASS
ok  	github.com/hashicorp/terraform-provider-vault/vault	1.681s