Run auto-tick with a single package only

[ytausch]

This PR adds an argument to the auto-tick command allowing it to be run with a single package only for easier debugging.

Cc @pavelzw

• Pydantic model updated or no update needed
• Add an Integration Test (see comment)

[codecov]

Codecov Report

Attention: Patch coverage is 54.16667% with 33 lines in your changes missing coverage. Please review.

Project coverage is 77.71%. Comparing base (6d941e7) to head (3acde80).

Files with missing lines	Patch %	Lines
conda_forge_tick/auto_tick.py	21.95%	32 Missing ⚠️
conda_forge_tick/make_migrators.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2813      +/-   ##
==========================================
- Coverage   77.80%   77.71%   -0.09%     
==========================================
  Files         128      128              
  Lines       13841    13880      +39     
==========================================
+ Hits        10769    10787      +18     
- Misses       3072     3093      +21     

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[ytausch]

Since it's still very burdensome to add a fully-fledged integration/end-to-end test for the auto-tick command, I decided to skip it for now. When we deal with #261, we might also have a look at testing the dry-run mode.

[beckermr]

I made some initial comments. package needs to be changed to feedstock everywhere. After the existing comments are addressed, I'll take another look.

[ytausch]

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