[CPDEV-100414] Install and check thirdparties skipping SSL verification

[ilia1243]

Description

• Install and check thirdparties skipping SSL verification.

Solution

• Added curl -k option during install.
• Disable SSL verification in check_url_availability.py using custom SSL context in HTTPSHandler.
• software.thirdparties.availability check now respects probably not yet installed resolv.conf.

Test Cases

TestCase 1

Test Configuration:

• OS: Ubuntu 22.04 / Centos 7
• Inventory: services.thirdparties.source with self-signed certificate.

Steps:

1. Install the cluster.

Results:

Before	After
Installation fails	Installation succeeds

TestCase 2

Test Configuration:

• OS: Ubuntu 22.04 / Centos 7
• Inventory: services.thirdparties.source with self-signed certificate.

Steps:

1. Run check_iaas --tasks software.thirdparties.availability

Results:

Before	After
Check fails	Check succeeds

Checklist

• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• Integration CI passed
• Unit tests. If Yes list of new/changed tests with brief description
• There is no merge conflicts