feat: Fix log/metrics endpoints when fips enabled

[sydefz]

Description of changes:

Currently when setting AWS_USE_FIPS_ENDPOINT the cloudwatch agent doesn't use fips endpoints, this PR adds logic to adopt the correct fips and region endpoints for cloudwatch agent to send logs and metrics.

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[chn217]

Hi Paul,

Thanks for the pull request and for fixing the issue. The code changes look good to me. However, I noticed that there is an npm package vulnerability reported by npm audit. Could you please run npm audit fix to resolve the vulnerability and submit the pull request again with the updated package dependencies? This will help ensure that our project is secure and up-to-date with the latest package versions.

Thanks

[sydefz]

@chn217 I tried to run npm audit fix but the result suggests no vulnerabilities, I'm on node v20.4.0

% npm audit
found 0 vulnerabilities

[sydefz]

ah ignore the previous comment, im running it in a wrong folder. updating the PR now

[chn217]

Thanks Paul.