feat(commands/mr/checkout): accept OWNER:branch format for MRs

[maxice8]

Description

This allows users to use mr checkout <branch> and mr checkout OWNER:branch to checkout by the branch instead of requiring to use the ID

Related Issue

Resolves #528

How Has This Been Tested?

On gitlab.alpinelinux.org instance

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
• Chore (Related to CI or Packaging to platforms)

[codecov]

Codecov Report

Merging #529 (80ffb73) into trunk (1c17a7d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            trunk     #529   +/-   ##
=======================================
  Coverage   59.19%   59.19%           
=======================================
  Files          85       85           
  Lines        5737     5737           
=======================================
  Hits         3396     3396           
  Misses       2006     2006           
  Partials      335      335           

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[profclems]

Thanks for taking this on!

Something small to fix up:
The usage info must include branch

Use:   "checkout {<id> | <branch>}",

[maxice8]

Done, thanks.

Changes applied

[profclems]

One last thing

[profclems]

All clear... thanks a lot!