remove GTM scripts

[ayush-billore]

Description

As GTM is not working correctly with onetrust, owing to timelines we decided to go ahead only with onetrust. Hence reverting GTM integration code.

Issues Resolved

[List any existing issues this PR resolves, or any Discourse or
StackOverflow discussions that are relevant]

Check List

• New functionality includes tests
• All buildkite tests pass
• Full omnibus build and tests in buildkite pass
• All commits have been signed-off for the Developer Certificate of Origin. See https://github.com/chef/chef/blob/main/CONTRIBUTING.md#developer-certification-of-origin-dco
• PR title is a worthy inclusion in the CHANGELOG

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[sonarcloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
1 Security Hotspot
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[sonarqube-for-infrastructure-prod]

SonarQube Quality Gate

0.0% Security Hotspots Reviewed on New Code (is less than 100%)

See analysis details on SonarQube

[sreepuramsudheer]

Adhoc build: https://buildkite.com/chef/chef-chef-server-main-omnibus-adhoc/builds/6080