feat(remote): activate integration if remote is set manually

[orhun]

Description

Before this change the only way of activating a remote integration (and fetching remote data) used to be incorporating the related variables in a template.

This meant that the changelog context won't contain e.g. GitHub related fields unless you use e.g. github.contributors in your template.

This PR adds support for enabling the remote integration for the following cases as well:

• If the [remote] table is configured.
• If remote is set via command-line arguments (e.g. --github-repo)

So the following output will contain GitHub variables even with the default template (since the remote is set):

$ git cliff --context --github-repo orhun/git-cliff

Motivation and Context

closes #780

How Has This Been Tested?

Unit tests, local run.

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have formatted the code with rustfmt.
• I checked the lints with clippy.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

Attention: Patch coverage is 35.71429% with 18 lines in your changes missing coverage. Please review.

Project coverage is 36.97%. Comparing base (4b0c0eb) to head (b59377a).

Files	Patch %	Lines
git-cliff/src/lib.rs	0.00%	11 Missing ⚠️
git-cliff-core/src/changelog.rs	66.67%	4 Missing ⚠️
git-cliff-core/src/repo.rs	0.00%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #782      +/-   ##
==========================================
- Coverage   36.97%   36.97%   -0.00%     
==========================================
  Files          20       20              
  Lines        1531     1542      +11     
==========================================
+ Hits          566      570       +4     
- Misses        965      972       +7     

Flag	Coverage Δ
unit-tests	36.97% <35.72%> (-<0.01%)	⬇️

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[janbuchar]

Hi @orhun, I just tested this locall and I confirm it works as expected, thanks!

[orhun]

Thanks for testing!