Remove usage of ca path

[vaavva]

Purpose

• remove all references to ca path and use workaround to not need it for C samples (we now use mosquitto to get the OS certs if we don't have a ca file and use_TLS is true)

Checklist

• [x] I have read the contribution guidelines.
• I submitted this PR against the correct branch:
  • [x] This pull-request is submitted against the main branch.
  • [x] I have merged the latest main branch prior to submission and re-merged as needed after I took any feedback.
  • [x] I will squash my changes into one with a clear description of the change when I complete the PR.

Does this introduce a breaking change?

[x] Yes
[ ] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

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Other Information