tools: synchronize deepStrictEqual() message rules
Update ESLint config to include a rule about assert.deepStrictEqual() messages and string literals. The rule is included in lib and test, but should be included everywhere else as well.
(Whoops! This was my mistake in b7661a83.)
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines