Add ability to test feature branches in TeamCity

[SarahFrench]

This PR is the equivalent of #8388 (comment) but going into the FEATURE-BRANCH-major-release-5.0.0 branch

Release Note Template for Downstream PRs (will be copied)

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

Terraform GA: Diff ( 10 files changed, 93 insertions(+), 36 deletions(-))
Terraform Beta: Diff ( 10 files changed, 93 insertions(+), 36 deletions(-))
TF Conversion: Diff ( 1 file changed, 1 insertion(+), 1 deletion(-))

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

Terraform GA: Diff ( 10 files changed, 93 insertions(+), 36 deletions(-))
Terraform Beta: Diff ( 10 files changed, 93 insertions(+), 36 deletions(-))
TF Conversion: Diff ( 1 file changed, 1 insertion(+), 1 deletion(-))