[Feature] Improve base branch selection in compare

[wcchang1115]

PR checklist

• [x] Ensure you have added or ran the appropriate tests for your PR.
• [x] DCO signed

What type of PR is this? feature

What this PR does / why we need it:

• When piperider compare is executed, piperider automatically generates a recipe for users.
• We need a better way to give users a hint to specify the base branch and deal with the branch not found problem.

Which issue(s) this PR fixes: sc-32156

866

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[codecov[bot]]

Codecov Report

Merging #880 (52a79ad) into main (47999a3) will decrease coverage by 0.06%. Report is 6 commits behind head on main. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #880      +/-   ##
==========================================
- Coverage   46.46%   46.40%   -0.06%     
==========================================
  Files          75       75              
  Lines       10341    10356      +15     
==========================================
+ Hits         4805     4806       +1     
- Misses       5536     5550      +14     

Files Changed	Coverage Δ
piperider_cli/cli.py	65.10% <ø> (ø)
piperider_cli/recipe_executor.py	0.00% <0.00%> (ø)
piperider_cli/recipes/default_recipe_generator.py	0.00% <0.00%> (ø)
piperider_cli/recipes/utils.py	0.00% <0.00%> (ø)

... and 2 files with indirect coverage changes

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[sentry-io[bot]]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ RecipeException: Cannot find specified base branch: test/test-branc piperider_cli.recipes.default_recipe_generator ... View Issue
• ‼️ RecipeException: Cannot find specified base ref: abc piperider_cli.recipes.default_recipe_generator ... View Issue

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