chore: datasourcecontextservice refactor

[sondermanish]

Description

In order to account for multiple environments changes, the DatasourceContextServiceImpl.java methods needs refactoring to achieve minimal code duplicity.

• [x] Create class to hold the key for dscontext maps.
• [x] Refactor methods in order to have minimum duplicity.

Fixes #19451

Type of change

• chore

This has been tested

• Manual
• Jest
• Cypress

Checklist:

Dev activity

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [ ] PR is being merged under a feature flag

[vercel[bot]]

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1 Ignored Deployment

Name	Status	Preview	Updated
appsmith	⬜️ Ignored (Inspect)		Jan 12, 2023 at 7:26AM (UTC)

[sondermanish]

/ok-to-test sha=42d6ef8

[sondermanish]

/ok-to-test sha=42d6ef8

[AnandShahs123]

@sondermanish Tested following DS Rest API SAAS INtegration (Airtable) Gsheet Postgres Mongo S3 Mysql

Got issue on gsheet (which is an issue related to local) {"responseMeta":{"status":500,"success":false,"error":{"code":5000,"message":"Internal server error while processing request"}}}

Rest worked fine.

[github-actions[bot]]

Tests running at: https://github.com/appsmithorg/appsmith/actions/runs/3930786083. Workflow: Appsmith External Integration Test Workflow. Commit: 42d6ef8. PR: 19485. Perf tests will be available at https://app.appsmith.com/app/performance-infra-dashboard/pr-details-638dd7cd2913ba43778b915e?pr=19485&runId=3930786083_1