feat: Udpated MacOS install script

[dpaasman00]

Proposed Change

Updates MacOS install script and service file to run with opamp supervisor

To test, run make release-test and then run /scripts/install/install_macos.sh -f /path/to/darwin/tarball ... with the rest of the arguments like endpoint and secret key (i just copied these from the cmd in the BP UI).

You should see the agent is connected.

A couple notes:

• install_id label isn't working, so agent won't appear under the new agent connections screen while on the install page
• the agent log has a lot of errors about not being able to connect to the opamp server, but rolling out a config to the agent works fine and fixes it... not sure why this happens yet

Checklist

• [ ] Changes are tested
• [ ] CI has passed