Filter module source registry completion requests

[dbanck]

Background

After the introduction of completion for registry module sources in #1024, we're now seeing an increasing amount of queries for . and .. in Algolia.

Sending these queries doesn't yield any results, so we should filter and avoid them in the language server.

Proposal

Rework the existing logic of checking for local module sources to a more generic blocklist of terms.

terraform-ls/internal/hooks/module_source_registry.go

Lines 48 to 51 in 1f90d9a

	if isModuleSourceLocal(prefix) {
	// We're dealing with a local module source here, no need to search the registry
	return candidates, nil
	}

The new blocklist should include entries for . and ...

[github-actions]

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