feat(ast-spec): extract AssignmentOperatorToText

[MichaelDeBoey]

This also makes AssignmentExpression's operator more type-safe whenever there would be a new AssignmentOperator

[typescript-eslint]

Thanks for the PR, @MichaelDeBoey!

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The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

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[MichaelDeBoey]

Same as in #3529

Comment needed to be added after readonly line because of prettier/prettier#11098

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[bradzacher]

awaiting updates to #3623

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[codecov]

Codecov Report

Merging #3570 (c4bfb07) into main (b67b6e4) will increase coverage by 0.37%.
The diff coverage is n/a.

❗ Current head c4bfb07 differs from pull request most recent head df51533. Consider uploading reports for the commit df51533 to get more accurate results

@@            Coverage Diff             @@
##             main    #3570      +/-   ##
==========================================
+ Coverage   91.33%   91.70%   +0.37%     
==========================================
  Files         132      363     +231     
  Lines        1488    12205   +10717     
  Branches      224     3541    +3317     
==========================================
+ Hits         1359    11193    +9834     
- Misses         65      662     +597     
- Partials       64      350     +286     

Flag	Coverage Δ
unittest	91.70% <ø> (+0.37%)	⬆️

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Impacted Files	Coverage Δ
...es/eslint-plugin/src/rules/parameter-properties.ts	94.11% <0.00%> (ø)
packages/utils/src/ts-eslint-scope/Referencer.ts	100.00% <0.00%> (ø)
...s/utils/src/ast-utils/eslint-utils/astUtilities.ts	100.00% <0.00%> (ø)
...s/eslint-plugin/src/util/collectUnusedVariables.ts	93.19% <0.00%> (ø)
packages/eslint-plugin/src/util/escapeRegExp.ts	75.00% <0.00%> (ø)
packages/eslint-plugin/src/rules/no-namespace.ts	100.00% <0.00%> (ø)
...nt-plugin/src/rules/lines-between-class-members.ts	92.85% <0.00%> (ø)
...es/eslint-plugin/src/rules/object-curly-spacing.ts	100.00% <0.00%> (ø)
...slint-plugin/src/rules/prefer-enum-initializers.ts	100.00% <0.00%> (ø)
packages/eslint-plugin/src/util/astUtils.ts	83.33% <0.00%> (ø)
... and 221 more

[MichaelDeBoey]

@bradzacher Since #3623 is closed, I guess we can merge this one? 🤔

[bradzacher]

LGTM - thanks!