Add mts and cts to test match and test regex

[yinm]

Summary

ref: #14149

This PR will solve

All of these extensions are missing from testMatch and testRegex.

Test plan

test locally

# /jest/e2e/test-match-default
$ node ../../packages/jest-cli/bin/jest.js
 PASS  __tests__/test.js
 PASS  dot-spec-tests/test.spec.jsx
 PASS  __tests__/test.cjs
 PASS  dot-spec-tests/test.spec.cjs
 PASS  dot-spec-tests/test.spec.cts
 PASS  dot-spec-tests/test.spec.tsx
 PASS  __tests__/test.tsx
 PASS  dot-spec-tests/test.spec.js
 PASS  __tests__/test.ts
 PASS  dot-spec-tests/test.spec.mjs
 PASS  __tests__/test.cts
 PASS  __tests__/test.mjs
 PASS  dot-spec-tests/test.spec.mts
 PASS  dot-spec-tests/test.spec.ts
 PASS  __tests__/test.mts
 PASS  __tests__/test.jsx

Test Suites: 16 passed, 16 total
Tests:       16 passed, 16 total
Snapshots:   0 total
Time:        0.694 s, estimated 1 s
Ran all test suites.

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[yinm]

Default option of testRegex is []. I think it's according to testMatch and testRegex can't be specified both options.
So, I only changed packages/jest-config/src/ValidConfig.ts and docs.

[SimenB]

nice 👍

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