Issue #11665: Create a robust method of surviving mutation suppression

[Vyom-Yadav]

Resolves #11665

Only the last commit is under review.

Proofs ->

• CI task failing from 1 extra mutation in file
• CI task failing from more than 1 extra mutation in file
• CI task failing from 1 missing mutation in file
• CI task failing from more than 1 missing mutation in file
• Proof of parsing comments in suppression file, multiple line and single. Comments are present in multiple suppressions files, with no problem whatsoever.
• Proof of same mutations from pitest.sh via cli (can just use grep/ sed/ diff). We may have been obfuscating multiple violations previously, we should keep this in mind when considering results.

Here is the difference between old pitest suppressions and new pitest suppressions.
The topmost mutation } is due to hcoles/pitest#688 (See this) and the 6 added mutations were multiple mutations on the same line. Report is good according to me. A mix of sed, awk, groovy was used, report is accurate.

• --list functionality (CI task)

[nrmancuso]

@Vyom-Yadav let's add codenarc to CI execution now that we are adding groovy to main repo. Take a look at contribution to see how it is done there: https://github.com/checkstyle/contribution/blob/master/checkstyle-tester/codenarc.sh

Issue created at #11734

[nrmancuso]

Some early feedback:

[romani]

Items

[romani]

Ok to merge

[nrmancuso]

We can deal with team city failures later, let's get this merged and kill some mutants.