fix(changelog): don't change the context when provided via --from-context

[weichweich]

closes /issues/819

Description

A method is added that only adds the additional context remote inside the Changelog struct and does not query commit information.

Motivation and Context

see issue /issues/819

How Has This Been Tested?

I created a changelog and checked that the Gitlab PR information are not changed.

Screenshots / Logs (if applicable)

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]

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Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 40.13%. Comparing base (7415289) to head (956d3d0).

Files	Patch %	Lines
git-cliff/src/lib.rs	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #820      +/-   ##
==========================================
+ Coverage   40.02%   40.13%   +0.11%     
==========================================
  Files          20       20              
  Lines        1642     1645       +3     
==========================================
+ Hits          657      660       +3     
  Misses        985      985              

Flag	Coverage Δ
unit-tests	40.13% <83.34%> (+0.11%)	⬆️

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[orhun]

LGTM, thanks for the fix!