bug#69405: [PATCH] .emacs.d/tree-sitter/ not used in tree-sitter tests

[Mattias Engdegård]

The .emacs.d/tree-sitter/ directory isn't searched when running tests 
non-interactively. The Makefile sets HOME to /nonexistent, which is correct but 
has the unfortunate side-effect of not running all the tests properly even with 
the compiled grammars installed.

The attached patch adds an environment variable, EMACS_TREE_SITTER_DIR, and 
sets it in the Makefile. I didn't bother documenting it because it's only 
intended for use in our own tests.

test-treesit-dir.diff
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