Revert generate cert file permission

[AnujaKalahara99]

Purpose

Enable local Event Gateway Kafka TLS/SASL development and harden a few related runtime paths. Resolves N/A.

Goals

Allow the dev Kafka stack to start reliably with generated certs, support Kafka TLS/SASL config in the runtime, and keep WebSub subscription sync and compacted-topic handling correct.

Approach

Added local Kafka cert generation and compose wiring, implemented Kafka TLS/SASL config support in the broker driver, verified existing compacted topics before accepting them, and removed Kafka-specific coupling from subscription
sync code.

User stories

As a developer, I can run the local Event Gateway stack with secured Kafka and have WebSub state sync continue to work correctly.

Documentation

N/A - local dev and internal runtime behavior changes only.

Automation tests

• Unit tests
  Focused Kafka broker-driver tests added/updated; targeted package tests passed locally.
• Integration tests
  Not run.

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes
• Ran FindSecurityBugs plugin and verified report? no
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes

Samples

Local Docker Compose Kafka dev setup with generated TLS artifacts.

Related PRs

N/A

Test environment

Ubuntu 24.04 local dev environment.

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