[ANSIENG-5269] | Replace community.crypto module with openssl

[rkunwar-28]

Description

Tests:

1. This screen-capture shows output comparison from the two methods (community.crypto and openssl). The "TASK [Compare chain files from both methods]" shows that diff_result.stdout = "" which means that the final certificate generated by both the commands is same.

2. molecule run - https://semaphore.ci.confluent.io/workflows/7ba77903-dd2e-4073-880c-a9ed4f04eae3

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

Checklist:

• Any variable/code changes have been validated to be backwards compatible (doesn't break upgrade)
• I have added tests that prove my fix is effective or that my feature works
• If required, I have ensured the changes can be discovered by cp-ansible discovery codebase
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[Copilot]

Pull Request Overview

This PR replaces the Ansible community.crypto module usage with direct OpenSSL commands to build and verify the certificate chain.

• Remove slurp and community.crypto.certificate_complete_chain tasks
• Add shell-based concatenation of cert and CA, and verification via openssl verify

[ishikaa-p]

please link the semaphore job run.

[rrbadiani]

we can raise this pr from some older .x branch and then pint merge to here. or if we just want to go with 8.0 first we can raise the pr against it and later cherry pick it to older .x branches