fix(windows): use `git-lfs` installer and bump its version to 3.5.1

[lemeurherve]

Same as https://github.com/jenkinsci/docker-agent/pull/503, this PR mainly add git to the PATH before running git-lfs.exe install instead of git lfs install to avoir the error git: 'lfs' is not a git command. encountered when bumping git-lfs to its 3.4.0 version, cf https://github.com/jenkinsci/docker-ssh-agent/pull/277#issuecomment-1630239571

Other notable changes:

• test added to check if git-lfs (and thus git) is installed and in the PATH
• trimprefix added to the git-lfs source in the corresponding updatecli manifest, easier to work with in files operations and in test

Supersedes and closes #277

Testing done

### Submitter checklist
- [x] Make sure you are opening from a **topic/feature/bugfix branch** (right side) and not your main branch!
- [x] Ensure that the pull request title represents the desired changelog entry
- [x] Please describe what you did
- [x] Link to relevant issues in GitHub or Jira
- [x] Link to relevant pull requests, esp. upstream and downstream changes
- [x] Ensure you have provided tests - that demonstrates feature works or fixes the issue

[lemeurherve]

Will probably need #292 & #302

[MarkEWaite]

Are these changes are needed in the proposed upgrade to 3.5.1 as well?

• #366

[lemeurherve]

Are these changes are needed in the proposed upgrade to 3.5.1 as well?

• Bump git-lfs version on Windows to v3.5.1 #366

I think so, I need to check that.

[lemeurherve]

updatecli is failing as one of its targets isn't in the primary branch yet.

[lemeurherve]

From https://ci.jenkins.io/job/Packaging/job/docker-ssh-agent/job/PR-318/21/console

00:05:07.923 Git LFS initialized.

🥳

Tests are still failing, but that's another issue (#292)