feat: remove 32bit platform check

[kruskall]

What does this PR do?

remove 32bit platform check on startup
bump elastic-agent-system-metrics lib to completely drop the dependency

Why is it important?

elastic agent dropped support for 32bit systems a long time ago so the check will always pass

Checklist

• 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
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in ./changelog/fragments using the changelog tool
• I have added an integration test or an E2E test

Disruptive User Impact

How to test this PR locally

Related issues

Questions to ask yourself

• How are we going to support this in production?
• How are we going to measure its adoption?
• How are we going to debug this?
• What are the metrics I should take care of?
• ...

[mergify]

This pull request does not have a backport label. Could you fix it @kruskall? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v./d./d./d is the label to automatically backport to the 8./d branch. /d is the digit

NOTE: backport-skip has been added to this pull request.

[elasticmachine]

Pinging @elastic/elastic-agent-control-plane (Team:Elastic-Agent-Control-Plane)

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarQube

[andrzej-stencel]

Can you point to documentation describing when support for 32-bit platforms was dropped or what was the last version that supported 32-bit platforms?

[kruskall]

I'll link to the public support matrix to avoid linking to private issues:

From https://www.elastic.co/support/matrix#show_compatibility

Elastic Agent is not supported on 32-bit operating systems.

and

As of 8.0+ Beats do not support 32-bit operating systems.