Remove expected hints for shallow clone

[leander-dsouza]

Basic Info

Info	Please fill out this column
Ticket(s) this addresses	N/A
Primary OS tested on	Ubuntu
Is this a breaking change?	No
Does this PR contain AI generated software?	No

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Description of contribution in a few bullet points

• Adjusted the expected value of shallow clone to remove hints: before comparing with output.
  This is seen in newer versions of git, where the following message is printed:

  hint: Using 'master' as the name f"
      +  b'or the initial branch. This default branch name\nhint: is subject to chan'
      +  b'ge. To configure the initial branch name to use in all\nhint: of your new'
      +  b' repositories, which will suppress this warning, call:\nhint:\nhint: \tgit '
      +  b'config --global init.defaultBranch

• This is motivated by Add Codecov testing workflow #53, as the disabling of the below messages is not possible when using a custom image with ros-infrastructure/ci/.github/workflows/pytest.yaml@main.

  git config --global --add init.defaultBranch main
  git config --global --add advice.detachedHead true

• The hint messages are disabled only for the test_import_shallow test. This is because only this test fails under ubuntu-latest. If windows-2025 or macos-latest images are used, all of them fail, as the hints are forced for all the git commands.

  Since the codecov action is only run on ubuntu-latest, disabling the test_import_shallow test is sufficient.

• Added the test_workspace to the .gitignore file to safely ignore the dummy folder during test runs.

Description of how this change was tested

• Verified that the code passes all tests using pytest -s -v test

[leander-dsouza]

Closing this PR in favour of #58.