chore(eslint): align preset and dep versions across the fleet

[mridang]

Description

Bump @mridang/eslint-defaults to ^1.6.3, eslint to ^9.39.1, prettier to ^3.6.2. Normalise the ignores list to one canonical set. Existing per-repo overrides preserved.

Related Issue

N/A.

Motivation and Context

Versions had drifted. Aligning now makes future fleet upgrades one bump.

How Has This Been Tested?

lint, format:check, prepack, depcheck all green.

Documentation:

N/A.

Checklist:

• I have updated the documentation accordingly.
• I have assigned the correct milestone or created one if non-existent.
• I have correctly labeled this pull request.
• I have linked the corresponding issue in this description.
• I have requested a review from at least 2 reviewers
• I have checked the base branch of this pull request
• I have checked my code for any possible security vulnerabilities

[github-actions]

Qodana for JS

45 new problems were found

Inspection name	Severity	Problems
ESLint	🔴 Failure	14
Import can be shortened	🔶 Warning	27
Redundant local variable	🔶 Warning	2
Exception used for local control-flow	🔶 Warning	1
Duplicated code fragment	◽️ Notice	1

💡 Qodana analysis was run in the pull request mode: only the changed files were checked
☁️ View the detailed Qodana report

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