tools: simplify no-unescaped-regexp-dot rule
no-unescaped-regexp-dot ESLint custom rule contains feature detection that is not needed on master or the v6.x-staging branch. The rule does not exist in the v4.x-staging branch. Remove the unnecessary complexity.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
tools