test(NODE-4800): update build env scripts

[durran]

Description

Update to latest drivers evergreen tools scripts.

Test failures on latest related to: https://jira.mongodb.org/browse/DRIVERS-2490

What is changing?

• Replaces usages of csfle/activate_venv.sh with csfle/activate-kmstlsvenv.sh.
• Replaces usages of auth_aws/activate_venv.sh with auth_aws/activate-authawsvenv.sh.
• Ensure new scripts are run in a bash shell.
• No usages of the utils script or OCSP in this repo.
• No usages of any of the scripts in our other managed repos. Changes only needed here.

Is there new documentation needed for these changes?

None

What is the motivation for this change?

NODE-4800

Double check the following

• Ran npm run check:lint script
• Self-review completed using the steps outlined here
• PR title follows the correct format: type(NODE-xxxx)[!]: description
  • Example: feat(NODE-1234)!: rewriting everything in coffeescript
• Changes are covered by tests
• New TODOs have a related JIRA ticket

[baileympearson]

There are a couple references to activate_venv in the test readme - can we update those references as well?

[durran]

There are a couple references to activate_venv in the test readme - can we update those references as well?

Updated.