fix: correct default value backfill during AddField

[czs007]

issue: https://github.com/milvus-io/milvus/issues/44585

[sre-ci-robot]

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This pull-request has been approved by: czs007

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[codecov[bot]]

Codecov Report

:x: Patch coverage is 11.73913% with 203 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 76.49%. Comparing base (caed0fe) to head (44a1bb2). :warning: Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/util/timestamptz/timestamptz.go	13.08%	164 Missing and 2 partials :warning:
...tcoord/ddl_callbacks_alter_collection_add_field.go	0.00%	5 Missing and 1 partial :warning:
internal/proxy/http_req_impl.go	0.00%	4 Missing and 1 partial :warning:
internal/proxy/service_provider.go	20.00%	3 Missing and 1 partial :warning:
internal/proxy/validate_util.go	0.00%	3 Missing :warning:
internal/parser/planparserv2/parser_visitor.go	0.00%	2 Missing :warning:
internal/proxy/task.go	0.00%	0 Missing and 2 partials :warning:
internal/proxy/task_database.go	0.00%	0 Missing and 2 partials :warning:
internal/rootcoord/create_collection_task.go	0.00%	0 Missing and 2 partials :warning:
internal/util/importutilv2/parquet/field_reader.go	0.00%	2 Missing :warning:
... and 9 more

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #45634       +/-   ##
===========================================
- Coverage   83.18%   76.49%    -6.70%     
===========================================
  Files         521     1875     +1354     
  Lines       81313   292103   +210790     
===========================================
+ Hits        67642   223444   +155802     
- Misses      13671    61252    +47581     
- Partials        0     7407     +7407     

Components	Coverage Δ
Client	78.17% <ø> (∅)
Core	83.18% <ø> (ø)
Go	74.60% <11.73%> (∅)

Files with missing lines	Coverage Δ
internal/proxy/impl.go	72.69% <ø> (ø)
...ernal/rootcoord/ddl_callbacks_create_collection.go	85.81% <100.00%> (ø)
internal/rootcoord/describe_collection_task.go	91.89% <ø> (ø)
internal/rootcoord/root_coord.go	78.88% <ø> (ø)
internal/proxy/task_query.go	74.49% <0.00%> (ø)
internal/proxy/task_search.go	68.98% <0.00%> (ø)
internal/proxy/util.go	80.87% <0.00%> (ø)
...coord/ddl_callbacks_alter_collection_properties.go	79.48% <0.00%> (ø)
internal/rootcoord/ddl_callbacks_alter_database.go	71.77% <0.00%> (ø)
...nternal/rootcoord/ddl_callbacks_create_database.go	61.70% <0.00%> (ø)
... and 13 more

... and 1331 files with indirect coverage changes

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[mergify[bot]]

@czs007 cpu-e2e job failed, comment /run-cpu-e2e can trigger the job again.

[czs007]

/ci-rerun-ut-integration

[congqixia]

the conclusion offline is to address issues in next pr /lgtm