feat: ga4 update fro server container url

[utsabc]

What are the changes introduced in this PR?

Adding support for server container URL for GA4

What is the related Linear task?

Resolves INT-2454

Please explain the objectives of your changes below

Put down any required details on the broader aspect of your changes. If there are any dependent changes, mandatorily mention them here

Any changes to existing capabilities/behaviour, mention the reason & what are the changes ?

N/A

Any new dependencies introduced with this change?

N/A

Any new checks got introduced or modified in test suites. Please explain the changes.

N/A

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Developer checklist

• My code follows the style guidelines of this project

• No breaking changes are being introduced.

• All related docs linked with the PR?

• All changes manually tested?

• Any documentation changes needed with this change?

• I have executed schemaGenerator tests and updated schema if needed

• Are sensitive fields marked as secret in definition config?

• My test cases and placeholders use only masked/sample values for sensitive fields

• Is the PR limited to 10 file changes & one task?

Reviewer checklist

• Is the type of change in the PR title appropriate as per the changes?

• Verified that there are no credentials or confidential data exposed with the changes.

[linear]

INT-2454 GA4: Enable custom gtag url for hybrid mode

Issue Summary: To avoid ads blocker for gtag script, enable customer to input custom url for downloading the gtag from custom domain

Reviewers: krishna sudip

Server Side Container Support PRs
JS SDK - rudderlabs/rudder-sdk-js#1814