fluentassertions / fluentassertions / 31417102017

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Add HaveLineCount()/NotHaveLineCount() and ContainLine()/NotContainLine() to StringAssertions (#3297)

* Add HaveLineCount/NotHaveLineCount and ContainLine/NotContainLine to StringAssertions

Adds four new assertion methods to StringAssertions, resolving #3291:
- HaveLineCount / NotHaveLineCount: assert on the number of lines in a
  string, normalizing `\r\n`, `\n` and `\r` line endings.
- ContainLine / NotContainLine: assert whether a string contains a
  specific line. ContainLine returns an AndWhichConstraint exposing the
  matched line for further chaining.

Also fixes a pre-existing gap in the net6.0 API approval baseline
(missing BeJsonSerializable entries from #3293).

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

* Parameterize HaveLineCount success tests and add empty/newline-only cases

Addresses review feedback from @jnyrup on #3297.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

4113 of 4390 branches covered (93.69%)

Branch coverage included in aggregate %.

38 of 38 new or added lines in 1 file covered. (100.0%)

13283 of 13509 relevant lines covered (98.33%)

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