feat: Store client certificate paths in collection settings as relative to collection and display them the UI.

[pietrygamat]

Description

The UI for collection level certificates does not reveal which file is used for which domains, so the only way to make sure you are using correct keys is to remove and re-add them. Also, the paths to key and cert files are kept in bruno.json file as absolute paths, making it unsuitable for version control and sharing between users with various setups.

With this change, the paths picked with file picker are relative to current collection and displayed in the Client Certificates view of collection settings.

Note, the absolute paths are still supported, so collections using old format are not affected.

fixes #2420

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• The pull request only addresses one issue or adds one feature.
• The pull request does not introduce any breaking changes
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[pietrygamat]

@sanjai0py @helloanoop consider this one when merging of #2336 . Thanks.

[helloanoop]

@pietrygamat Can you fix the conflicts?
Otherwise this is GTG

[pietrygamat]

@helloanoop done.
As a sidenote: from my testing, when running bruno on Windows the path.relative produces wrong results (i.e. posix implementation is fired even though win32 one should). I am not sure it's my build issue, or electron issue.

I work around this by using:

      if (isWindowsOS()) {
        relativePath = slash(path.win32.relative(root, e.files[0].path));
      } else {
        relativePath = path.posix.relative(root, e.files[0].path);
      }

I think there are a couple more places in the application, that this may cause problems.