clean/ci: avoid running tests via GoReleaser & remove GO111MODULE

[radeksimko]

This is to avoid some CPU/time waste on running tests twice on every PR/push, which we generally always do as per our current GHA workflow setup.

terraform-ls/.github/workflows/ci.yml

Lines 3 to 9 in 4459e5c

	on:
	pull_request:
	branches:
	- main
	push:
	branches:
	- main

It does mean we'd no longer run tests as part of a release pipeline, but I'm not sure that was ever that much valuable anyway since we'd usually wait for the last main push CI workflow to turn green.

I'm also removing an old ENV variable GO111MODULE which is no longer relevant in the Go version we use.

[github-actions]

This functionality has been released in v0.29.1 of the language server.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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