refactor: remove contract test got dependency

[joker23]

Note

Low Risk
Low risk because changes are limited to contract-test helpers and build/lint configuration; main risk is contract tests failing in environments without a compatible global fetch implementation.

Overview
Contract-test HTTP calls now use fetch instead of got, including big segment store callbacks, migration endpoint invocations, and registerFlagChangeListener notifications, with basic response.ok/status error handling.

Removes got from contract-tests/package.json and @launchdarkly/js-contract-test-utils peer/dev dependencies, and drops the tsconfig.server.json path alias that existed to make got resolvable under ESM.

Adds a server-node .eslintrc.cjs override for contract-tests/**/*.ts, and adjusts tsconfig.eslint.json includes/excludes to avoid linting dist and contract-tests by default.

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[github-actions]

@launchdarkly/js-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 25566 bytes
Compressed size limit: 26000
Uncompressed size: 125383 bytes

[github-actions]

@launchdarkly/js-client-sdk size report
This is the brotli compressed size of the ESM build.
Compressed size: 24539 bytes
Compressed size limit: 25000
Uncompressed size: 85098 bytes

[github-actions]

@launchdarkly/browser size report
This is the brotli compressed size of the ESM build.
Compressed size: 172527 bytes
Compressed size limit: 200000
Uncompressed size: 802217 bytes

[github-actions]

@launchdarkly/js-client-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 22203 bytes
Compressed size limit: 24000
Uncompressed size: 115238 bytes

[joker23]

@cursor review
@devin review

[joker23]

@cursor review

[cursor]

✅ Bugbot reviewed your changes and found no new issues!

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 3 additional findings.