refactor(test): mv scripts/source e2e_test/source_legacy/basic/scripts

[xxchan]

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What's changed and what's your intention?

Motivation is to fully deprecate old styles and avoid developers adding new tests there.

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• I have added test labels as necessary. See details.
• I have added fuzzing tests or opened an issue to track them. (Optional, recommended for new SQL features Sqlsmith: Sql feature generation #7934).
• My PR contains breaking changes. (If it deprecates some features, please create a tracking issue to remove them in the future).
• All checks passed in ./risedev check (or alias, ./risedev c)
• My PR changes performance-critical code. (Please run macro/micro-benchmarks and show the results.)

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Documentation

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Release note

If this PR includes changes that directly affect users or other significant modifications relevant to the community, kindly draft a release note to provide a concise summary of these changes. Please prioritize highlighting the impact these changes will have on users.

[xxchan]

• test: add kafka backfill large data test #18924
• feat: support background DDL for MV on shared source #18919
• feat: enable shared source in session variable by default, and add cluster-level config to disable #18749
• refactor(test): move some tests from source_legacy to source_inline #18894
• refactor(test): mv scripts/source e2e_test/source_legacy/basic/scripts #18891 👈
• refactor(test): rename non-inline-style e2e_test/source to source_legacy #18890
• main

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[tabVersion]

approve for no logic change

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