Tweak support for 3.x in OldestSupportedClientVersion

[Craig Macomber (Microsoft) (CraigMacomber)]

Description

Tweak how we support version 3, removing the complications that we likely shouldn't have stabilized for 1 and 2 from the new 3 support before we stabilize.

Reviewer Guidance

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[github-actions]

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Based on the diff (75 lines, 16 files), I've queued these reviewers:

• Correctness — logic errors, race conditions, lifecycle issues
• Security — vulnerabilities, secret exposure, injection
• API Compatibility — breaking changes, release tags, type design
• Performance — algorithmic regressions, memory leaks
• Testing — coverage gaps, hollow tests

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[github-actions]

Bundle size comparison

Base commit: unresolved
Head commit: a39b8a9fc6bc494203dfd23a421c620df09814b2

⚠️ Comparison unavailable.

The PR's CI build failed — fix the build and the comment will update once the next run succeeds.

[github-actions]

🔗 Found some broken links! 💔

Run a link check locally to find them. See Checking for Broken Links for more information.

linkcheck output

1: starting server using command "npm run serve -- --no-open"
and when url "[ 'http://127.0.0.1:3000' ]" is responding with HTTP status code 200
running tests using command "npm run check-links"


> fluid-framework-website@0.0.0 serve
> docusaurus serve --no-open

[SUCCESS] Serving "build" directory at: http://localhost:3000/
[ELIFECYCLE] Command failed with exit code 1.