[Epic] Fix all frontend ESLint warnings — 0 warnings across the UI project

[ShaileshParmar11]

Epic: Fix all frontend ESLint warnings

Bring the entire openmetadata-ui project to 0 ESLint warnings / 0 errors across src/** and playwright/** (~9,270 pre-existing warnings resolved).

Delivered as 10 stacked PRs, one per rule-category, so each is independently reviewable (instead of one 1,400-file PR). Each PR is based on the previous one in the stack.

Approach

Every change is behavior-preserving and verified per PR (git-stash ESLint before/after diff + tsc regression check + prettier/tw-guard/check-i18n). Real fixes where safe; eslint-disable-with-reason where a genuine fix would risk bugs (e.g. react-hooks/exhaustive-deps — auto-fixing deps causes infinite renders/stale closures — and sonarjs complexity). i18next is turned off for test/mock files (no user-facing strings) via the existing test-file config override.

Sub-tasks — 10 stacked PRs (merge bottom-up, in order)

• 1. safe-mechanical + jsx-a11y — [ESLint 1/10] safe-mechanical (sonarjs) + jsx-a11y #30978 (PR [ESLint 1/10] Fix safe-mechanical (sonarjs) + jsx-a11y warnings #30989)
• 2. type-safety — [ESLint 2/10] type-safety (@typescript-eslint) #30979 (PR [ESLint 2/10] Fix type-safety (@typescript-eslint) warnings #30990)
• 3. react/* — [ESLint 3/10] react/* #30980 (PR [ESLint 3/10] Fix react/* warnings #30991)
• 4. clear-text-protocols + secrets — [ESLint 4/10] clear-text-protocols + secrets #30981 (PR [ESLint 4/10] Fix clear-text-protocols + secrets warnings #30992)
• 5. jest/no-disabled-tests — [ESLint 5/10] jest/no-disabled-tests #30982 (PR [ESLint 5/10] Fix jest/no-disabled-tests warnings #30993)
• 6. no-duplicate-string — [ESLint 6/10] sonarjs/no-duplicate-string #30983 (PR [ESLint 6/10] Fix sonarjs/no-duplicate-string warnings #30994)
• 7. i18next/no-literal-string — [ESLint 7/10] i18next/no-literal-string #30985 (PR [ESLint 7/10] Fix i18next/no-literal-string warnings #31031)
• 8. playwright/* — [ESLint 8/10] playwright/* #30987 (PR [ESLint 8/10] Fix playwright/* warnings #31032)
• 9. sonarjs complexity — [ESLint 9/10] sonarjs complexity #30984 (PR [ESLint 9/10] Fix sonarjs complexity warnings #30995)
• 10. exhaustive-deps + stragglers — [ESLint 10/10] react-hooks/exhaustive-deps + stragglers #30986 (PR [ESLint 10/10] Fix react-hooks/exhaustive-deps + stragglers warnings #30997)
• 11. also fixes 5450

⚠️ These are stacked PRs: PR1 merges into main first, then GitHub auto-retargets PR2 to main, and so on. They are independently reviewable but must merge in order — a strictly-independent split would conflict (later rules touch files earlier rules changed).

🔀 Reorder note: the two suppression-heavy rules — sonarjs complexity (~840 suppressed) and exhaustive-deps (~1,692 suppressed) — were moved to the end of the stack (positions 9–10) so the low-risk real fixes merge first and the suppression waves can be reviewed/revisited last. During that reorder the original i18n/playwright PRs (#30996, #30998) were auto-closed by GitHub and re-created as #31031 and #31032 with the correct bases.

Notes for reviewers

• exhaustive-deps (~1,692) and complexity (~840) are suppressed with reasons, not refactored — please spot-check that no suppressed dep is a latent bug. Each PR description has a "why suppressed" section.
• The i18n PR adds new en-us.json keys that are English placeholders in the 19 other locales — real translation is follow-up.
• No new tests (pure lint cleanup); the a11y PR also folds in a small DRY keyboard-handler helper.