Tests(refactor): Mirror the lgtm tests under tests/scripts

Both cover `scripts/lgtm/`, so they sit beside it. Their repository-root
lookups count directories, and the counts move with them.

The dashboard generator and the stack's README each pointed at the dashboard
test by its old name, which is the pairing this layout now makes checkable from
the path.

With these, no branch in the stack carries a `scripts/bench_*` or a
`tests/test_bench_*`: one convention, everywhere, rather than one that arrives
partway up.

Author: tony

scripts/lgtm/README.md

@@ -210,7 +210,7 @@ changing the generator:
 $ just otel-dashboards
 ```
 
-`up.sh` regenerates on every start, and `tests/test_lgtm_dashboards.py` fails if
+`up.sh` regenerates on every start, and `tests/scripts/lgtm/test_dashboards.py` fails if
 the committed JSON differs from what the generator produces, so the two cannot
 diverge quietly. Editing a board in the Grafana UI is fine for exploring; move
 the change into the generator to keep it.

scripts/lgtm/generate_dashboards.py

@@ -6,7 +6,7 @@
 list of panel calls and :class:`Board` does the grid math.
 
 The generated JSON is committed. ``scripts/lgtm/up.sh`` regenerates it on every
-start and ``tests/test_lgtm_dashboards.py`` fails if the committed copy differs,
+start and ``tests/scripts/lgtm/test_dashboards.py`` fails if the committed copy differs,
 so the two cannot silently diverge.
 
 Every panel must be backed by telemetry ``scripts/lgtm/smoke.py`` actually

tests/scripts/lgtm/__init__.py

@@ -0,0 +1 @@
+"""Tests for scripts/lgtm/."""

tests/test_lgtm_dashboards.py tests/scripts/lgtm/test_dashboards.pytests/test_lgtm_dashboards.py renamed to tests/scripts/lgtm/test_dashboards.py

@@ -18,7 +18,7 @@
 
 import pytest
 
-_ROOT = pathlib.Path(__file__).parents[1]
+_ROOT = pathlib.Path(__file__).parents[3]
 _LGTM = _ROOT / "scripts" / "lgtm"
 _DASHBOARDS = _LGTM / "dashboards"
 

tests/test_lgtm_load.py tests/scripts/lgtm/test_load.pytests/test_lgtm_load.py renamed to tests/scripts/lgtm/test_load.py

@@ -20,7 +20,7 @@
 
 import pytest
 
-_ROOT = pathlib.Path(__file__).parents[1]
+_ROOT = pathlib.Path(__file__).parents[3]
 
 
 _PREAMBLE = (