CI PR #2: Fix GitHub CI and add checks to compensate for code coverage

[bernhardkaindl]

Topic: Fix GitHub CI

• GitHub dropped support for EOL Python versions in GitHub CI

Contents:

• Commit 1 from CI PR #1: Fix GitHub CI and 'tox' for local CI on Ubuntu 24.04 #143:
  • It has become impractical to use EOL versions like Python 2.7 & 3.6 in CI
  • It has become counterproductive to use pyre CI, disable it for now.
  • Move forward to run the unit tests with Python 3.11
• Commits 2 and 3 (added with this PR):
  • Compensate the code coverage by adding new checks
  • Fix two spelling typos in the comments

Note:
If you have review comments, I'd like to apply them using the last PR in this series!

[coveralls]

Pull Request Test Coverage Report for Build 11858778149

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 12 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-0.009%) to 83.661%

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Files with Coverage Reduction	New Missed Lines	%
xcp/accessor.py	1	89.1%
xcp/xmlunwrap.py	2	92.31%
xcp/cpiofile.py	3	75.26%
xcp/compat.py	6	78.57%

Totals
Change from base Build 9109272969:	-0.009%
Covered Lines:	2806
Relevant Lines:	3354

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💛 - Coveralls