Add NotContainEquivalentOf with OccurrenceConstraint parameter for string assertions

[vbreuss]

As discussed in #2364 add an overload for NotContainEquivalentOf that takes an OccurenceConstraint parameter.

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[coveralls]

Pull Request Test Coverage Report for Build 6755617618

• 16 of 16 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.003%) to 97.39%

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Totals
Change from base Build 6754534983:	-0.003%
Covered Lines:	11751
Relevant Lines:	11942

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💛 - Coveralls

[dennisdoomen]

🔧 This isn't clear for me. How does the occurrence work in combination with "should not contain equivalent of"?

[jnyrup]

I'm having second thoughts on combining negated assertions with OccurenceConstraints.

"abbbc".Should().NotContainEquivalentOf("b", MoreThan.Once());

can also be expressed as the affirmative

"abbbc".Should().ContainEquivalentOf("b", AtMost.Once());

It took me an extra minute (at least) to realize that I also had to negate the OccurenceConstraint to actually assert what I intended to and also remember that the negation of AtMost is MoreThan, not AtLeast.

[vbreuss]

I'm having second thoughts on combining negated assertions with OccurenceConstraints.

Okay, I will remove this also from #2413 and close this PR...