tools: update ESLint to 7.15.0
Update ESLint to 7.15.0 and enable the new no-unsafe-optional-chaining rule.
Checklist
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make -j4 test(UNIX), orvcbuild test(Windows) passes -
commit message follows commit guidelines
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Do not update/delete: Notification broadcast message test data
Update ESLint to 7.15.0 and enable the new no-unsafe-optional-chaining rule.
make -j4 test (UNIX), or vcbuild test (Windows) passes