proxmox_node: improve certificate management (closes 231)

[itcultus]

Closes #231

SUMMARY

• Use correct custom certificate API endpoints (upload/delete)
• Fix overly generic error messages during certificate upload
• Exclude default Proxmox certificates (pve-ssl.pem, pve-root-ca.pem) from comparisons
• Fix state=absent implementation that previously used wrong endpoint
• Make all return messages more descriptive and user-friendly
• Add proper force handling and idempotency with leaf fingerprint check

Fixes #231

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

proxmox_node

ADDITIONAL INFORMATION

[Thulium-Drake]

I have approved the CI, can you take a look at the results of the tests? It seems unhappy :-)

[itcultus]

I have approved the CI, can you take a look at the results of the tests? It seems unhappy :-)

I saw it and I am puzzled as well. But yeah, let's see.
@Thulium-Drake , the main issue is that I assumed that python 3.7 is not needed anymore.
So, I use walrus assignment in one line. If we still need python 3.7 I can change it.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 36 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.54%. Comparing base (059dda2) to head (129b637).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
plugins/modules/proxmox_node.py	0.00%	36 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #232      +/-   ##
==========================================
- Coverage   69.65%   69.54%   -0.12%     
==========================================
  Files          77       77              
  Lines        8879     8895      +16     
  Branches     1811     1817       +6     
==========================================
+ Hits         6185     6186       +1     
- Misses       2406     2421      +15     
  Partials      288      288              

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[Thulium-Drake]

Thanks for this!

Ansible 2.17 is still a valid target for this collection, which supports Python 3.7 on the targets :-) so that's why we still support it.

[Thulium-Drake]

@IamLunchbox / @JanaHoch Can you also have a look? If you're happy, I'm happy!