✨ Migrate Command Handling to Cobra for Simplified Flag Management

[Horiodino]

This PR fixes the issue described in #1567.

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Description:

This PR migrates the command-line handling logic in the cmd/manager/main.go file to utilize the [Cobra CLI framework]. The migration simplifies flag handling, improves readability, and enhances the extensibility of the CLI for future development.

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Key Changes:

1. Cobra Root Command:

   • Introduced the rootCmd for top-level command handling, providing a clean and standardized entry point for the CLI.

2. Flag Migration:

   • Migrated all existing flags from the standard flag package to Cobra’s cmd.Flags() and cmd.PersistentFlags().

3. Subcommand Restructuring:

   • Refactored and restructured any existing subcommands under Cobra’s subcommand system.

4. Helper Functions:

   • Refined the main function by extracting logic into dedicated helper functions.

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[kevinrizza]

👋 Thanks for the contribution! Quick question, if we're going to do this for the catalogd binary, should we do the same for the operator-controller binary? I.e. https://github.com/operator-framework/operator-controller/blob/main/cmd/operator-controller/main.go

I suspect there will be some opinions on the functional refactoring as the controllers are set up (isn't some of that handled by controller runtime and kubebuilder?) and it would probably be good for us to match in those places. I know that's outside the scope of that github issue, but I think that's an artifact of these two binaries being part of separate repositories until very recently.

[LalatenduMohanty]

/assign @LalatenduMohanty

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 185 lines in your changes missing coverage. Please review.

Project coverage is 66.48%. Comparing base (fff1896) to head (6c4c4ab).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
catalogd/cmd/catalogd/main.go	0.00%	185 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1598      +/-   ##
==========================================
- Coverage   66.68%   66.48%   -0.21%     
==========================================
  Files          57       57              
  Lines        4584     4598      +14     
==========================================
  Hits         3057     3057              
- Misses       1302     1316      +14     
  Partials      225      225              

Flag	Coverage Δ
e2e	52.72% <ø> (ø)
unit	53.45% <0.00%> (-0.17%)	⬇️

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[grokspawn]

Hey @Horiodino! Thanks for your PR (especially since you noticed catalogd's new home and reproduced it here).
Could you do a make verify in your local and commit the dependency updates please?