Extract project files tracking into function

[jwortmann]

I noticed that the drive letter normalization from my PR #1313 was incomplete and also needs to be added for the environment changing via julia/activateenvironment here:

LanguageServer.jl/src/requests/misc.jl

Lines 85 to 109 in 0da181a

	# Add project files separately in case they are not in a workspace folder
	if server.env_path != ""
	for file in ["Project.toml", "JuliaProject.toml", "Manifest.toml", "JuliaManifest.toml"]
	file_full_path = joinpath(server.env_path, file)
	uri = filepath2uri(file_full_path)
	if isfile(file_full_path)
	# Only add again if outside of the workspace folders
	if all(i->!startswith(file_full_path, i), server.workspaceFolders)
	if haskey(server._files_from_disc, uri)
	error("This should not happen")
	end
	text_file = JuliaWorkspaces.read_text_file_from_uri(uri, return_nothing_on_io_error=true)
	text_file===nothing || continue
	server._files_from_disc[uri] = text_file
	if !haskey(server._open_file_versions, uri)
	JuliaWorkspaces.add_file!(server.workspace, text_file)
	end
	end
	push!(server._extra_tracked_files, filepath2uri(file_full_path))
	end
	end
	end

This exact same code is used in two places, so I extracted it into a new function track_project_files! (the diff for misc.jl on GitHub is unfortunately a bit misleading).

[jwortmann]

I split the PR up into 2 commits, to make it easier to review. I'd recommend to squash the commits when merging.

[jwortmann]

It would be great if this PR could be merged, because this bug is currently blocking the update of the server for clients that use uppercase drive letters.

[jwortmann]

Bump 🤷

Does anybody read issues and pull requests in this repository and is able to merge this?
The changes are really simple and it shouldn't take more than two minutes or so to review.