Fix project packages glob parsing

[philderbeast]

The failing test for #12171 and its fix.

$ cabal test cabal-install:parser-tests
...
Build profile: -w ghc-9.10.3 -O1
...
Running 1 test suites...
Test suite parser-tests: RUNNING...
project files parsec tests                                                                                                                                                                                                                            
  read packages:                                    OK
  read packages glob:                               FAIL
    Exception: Error: [Cabal-7167]
    Error parsing project file cabal.glob.project:
    
    cabal.glob.project:3:28: error:
      unexpected ','
      expecting white space, string, identifier or end of input
          3 | packages: */*.cabal ../{foo,bar}/
            |                            ^    
    
    Use -p '/read packages glob/' to rerun this test only.

I'll squash commits before applying the merge label if this pull request is approved.

---

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• The documentation has been updated, if necessary.
• Manual QA notes have been included.
• Tests have been added.

[Mikolaj]

Where are the globs handled in the code? I only see the curly braces syntax, which is only the half of the example in the issue.

[philderbeast]

Where are the globs handled in the code? I only see the curly braces syntax, which is only the half of the example in the issue.

@Mikolaj as well as the parser tests, I've added a doctest example here, same as the one in the users guide.