chore: Removes unused varaibles from evergreen actions

[cveticm]

Proposed changes

Removes unused expansions from evergreen.yml.
This work also saw the following removals of some variables/secretes from the atlas-cli-plugin-kubernetes Evergreen project:

• Atlas Gov creds (AKO does not do testing on cloud-gov as of this moment)
  • atlas_gov_org_id
  • atlas_gov_private_api_key
  • atlas_gov_project_id
  • atlas_gov_public_api_key
  • mcli_cloud_gov_ops_manager_url
• Cloud provider creds
  • aws_key
  • aws_secret
  • azure_app_id
  • azure_password
  • azure_subscription_id
  • azure_tenant
  • gcp_credentials
• Release upload creds (Plugin packages are only release on github)
  • barque_api_key
  • barque_password
  • barque_url
  • barque_user
  • chocolatey_api_key
  • download_center_aws_key
  • download_center_aws_secret
• Unused e2e vars
  • .e2e_cloud_role_id
  • .e2e_serverless_instance_name
  • e2e_test_bucket
  • identity_provider_id
  • logs_decrypt_aws_access_key
  • logs_decrypt_aws_secret_access_key
  • logs_decrypt_azure_client_id
  • logs_decrypt_azure_client_secret
  • logs_decrypt_azure_tenant_id
  • logs_decrypt_gcp_credentials
• Unused signing auth tokens
  • signing_auth_token_42
  • signing_auth_token_44
  • signing_auth_token_46
  • signing_auth_token_50
  • signing_auth_token_60
  • signing_auth_token_70

Jira ticket: CLOUDP-297727

Checklist

• I have signed the MongoDB CLA
• I have added tests that prove my fix is effective or that my feature works
• I have added any necessary documentation in the document requirements section listed in CONTRIBUTING.md (if appropriate)
• I have addressed the @mongodb/docs-cloud-team comments (if appropriate)
• I have run make fmt and formatted my code

Further comments