Makefile improvements.

[sagiegurari]

Really cool crate. Trying to help a bit sort out and remove duplications in the makefile.

• Default message is now in duckscript so its same code for all platforms. no need for code duplication.
• start/stop search task has a base task so common code is there.
• start/stop search task no longer has a windows specific implementation
• Move CI env var which isn't supported for all CI vendors to CARGO_MAKE_CI which supports all.

Few questions/comments

1. I couldn't test it properly. i'm working on gitpod and i can't run docker. would love some help testing this.
2. why did you have the windows specific overrides? i understand why you need those when using script (that's why i converted to command+args which support var value replacement) but for start/stop elasticsearch tasks i'm not sure why it was needed. I don't have a windows machine to test (again need help with that as well) so i would love to understand more why your original tasks didn't work. because it looks like for those you simply also defined STACK_VERSION and TEST_SUITE on the command, but those env vars are already set.

[cla-checker-service[bot]]

💚 CLA has been signed

[elasticmachine]

Since this is a community submitted pull request, a Jenkins build has not been kicked off automatically. Can an Elastic organization member please verify the contents of this patch and then kick off a build manually?

[sagiegurari]

• signed the CLA
• few updates per comments (double check me)
• merged changes
• improved instructions printing per platform after merges

[sagiegurari]

@russcam I think everything is handled, but can you double check?