#1699 verify input git url

[SDallmann]

This PR fixes #1699

Implemented changes:

• Added the functionality to verify that the input Git URL is valid, i.e. it start with http, https, ssh or @git.
  If the input URL isn't valid, the user will be requested to provide the URL again.
• Added unit tests for this functionality.

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Checklist for this PR

Make sure everything is checked before merging this PR. For further info please also see
our DoD.

• When running mvn clean test locally all tests pass and build is successful
• PR title is of the form #«issue-id»: «brief summary» (e.g. #921: fixed setup.bat). If no issue ID exists, title only.
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  with internal

[coveralls]

Pull Request Test Coverage Report for Build 22072311146

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 21 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.02%) to 70.465%

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Files with Coverage Reduction	New Missed Lines	%
com/devonfw/tools/ide/git/GitUrl.java	3	87.72%
com/devonfw/tools/ide/commandlet/AbstractUpdateCommandlet.java	18	83.08%

Totals
Change from base Build 21513109358:	0.02%
Covered Lines:	10492
Relevant Lines:	14305

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💛 - Coveralls

[lubska]

I´ve checked the code and there are no comments on my side.

[hohwille]

@SDallmann thanks for your PR. Nice job 👍
Sorry, it took so long because I first was too busy and then sick.
I left some review comments for improvement.
After that we can merge.

[hohwille]

@SDallmann since you are in currently unavailable, I will simply apply the suggestions so I can already merge your PR and it can be included in the release that was postponed for this Thursday.