Clean up deprecated ESLint rules

[TamerlanG]

Summary

• replace no-new-symbol with its ESLint successor, no-new-native-nonconstructor
• replace the deprecated @typescript-eslint/prefer-ts-expect-error policy with an equivalent ban-ts-comment configuration
• remove deprecated no-return-await, obsolete jsx-a11y/no-onchange, and stale @typescript-eslint/no-undef configuration
• remove deprecated one-var-declaration-per-line, padded-blocks, and quotes assignments already neutralized by the final Prettier override
• remove two now-obsolete jsx-a11y/no-onchange suppressions

Why

These rules are deprecated, obsolete, invalid, or ineffective. Cleaning them up now avoids carrying known ESLint policy debt into the ongoing Oxlint migration. The successor rules preserve the intended constraints while tracking maintained implementations.

Deprecation and removal evidence

• ESLint marks no-new-symbol deprecated since v9 and directs users to no-new-native-nonconstructor.
• typescript-eslint marks prefer-ts-expect-error deprecated and directs users to ban-ts-comment.
• ESLint deprecated no-return-await because modern ECMAScript no longer adds an extra microtask and returning an awaited promise improves stack traces.
• jsx-a11y documents no-onchange as deprecated because the browser behavior it targeted was corrected.
• typescript-eslint does not export a no-undef extension rule and recommends disabling core no-undef for TypeScript.
• ESLint marks one-var-declaration-per-line, padded-blocks, and quotes deprecated formatting rules; Kibana already disables them through its final eslint-config-prettier override.

This PR deliberately leaves @typescript-eslint/no-empty-interface and @typescript-eslint/no-var-requires unchanged. Their successors broaden enforcement: no-empty-object-type affects existing empty contracts and suppressions, while no-require-imports also rejects standalone side-effect require() calls. Those require dedicated migrations rather than a configuration-only cleanup.

Verification

• verified no-new-native-nonconstructor directly with Kibana's pinned ESLint 8.57.0: it reports both new Symbol() and new BigInt() and ignores shadowed constructors
• verified the repository config activates no-new-native-nonconstructor in the intended scopes
• verified the replacement ban-ts-comment policy rejects @ts-ignore while allowing @ts-expect-error
• yarn kbn bootstrap
• node scripts/eslint_all_files --no-cache (102,948 files)

[infra-vault-gh-plugin-prod]

Pinging @elastic/kibana-operations (Team:Operations)

[kibanamachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: b774f4d
• Build duration: 68 mins
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Failed CI Steps

• Jest Tests #7
• FTR Configs #31
• Scout Lane #3 - stateful-classic / default
• Scout Lane #5 - stateful-classic / default

Metrics [docs]

Unknown metric groups

ESLint disabled line counts

id	before	after	diff
@kbn/alerting-v2-rule-form	2	1	-1
@kbn/file-upload	9	8	-1
total			-2

Total ESLint disabled count

id	before	after	diff
@kbn/alerting-v2-rule-form	2	1	-1
@kbn/file-upload	9	8	-1
total			-2

Test Failures

• [job] [logs] Jest Tests #7 / Bulk actions menu omits bulk delete when delete is not granted
• [job] [logs] Jest Tests #7 / DiscoverDocumentFlyout keeps the instance from the results when the direct fetch finishes after them
• [job] [logs] Scout Lane #3 - stateful-classic / default / local-stateful-classic - Discover tabs - opening a new tab - should be able to complete all quickly opened tabs
• [job] [logs] Scout Lane #3 - stateful-classic / default / local-stateful-classic - Discover tabs - tab preview - should preserve content after saving and loading
• [job] [logs] Scout Lane #3 - stateful-classic / default / local-stateful-classic - Discover tabs - time range - should save different time ranges when the switch is on
• [job] [logs] Scout Lane #5 - stateful-classic / default / local-stateful-classic - Lens ESQL dashboard inline editing - should add a limit without changing the chart type or the color