feat(ui/ingestion): add search by name on source selection screen

[purnimagarg1]

Linear ticket:
https://linear.app/acryl-data/issue/CAT-1004/implement-search-by-source-name-on-select-source-screen

Description:

Add search on source selection screen of create source flow. Also, use a single sources.json file

Screenshots:

[alwaysmeticulous]

✅ Meticulous spotted 0 visual differences across 987 screens tested: view results.

Meticulous evaluated ~8 hours of user flows against your PR.

_{Expected differences? Click here. Last updated for commit 763c812. This comment will update as new commits are pushed.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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[codecov]

Bundle Report

Changes will decrease total bundle size by 31.71kB (-0.11%) ⬇️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
datahub-react-web-esm	28.74MB	-31.71kB (-0.11%) ⬇️

Affected Assets, Files, and Routes:

view changes for bundle: datahub-react-web-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
assets/index-*.js	-31.71kB	19.11MB	-0.17%

Files in assets/index-*.js:

• ./src/app/ingestV2/source/builder/sources.json → Total Size: 36.8kB

• ./src/app/ingestV2/source/multiStepBuilder/steps/step1SelectSource/EmptySearchResults.tsx → Total Size: 451 bytes

• ./src/app/ingestV2/source/multiStepBuilder/steps/step1SelectSource/SelectSourceStep.tsx → Total Size: 4.39kB