fix(lsp): read self.context_state instead of stale local variable in _context_get_or_load #3707

Job	Run time
test-dbt-versions (1.8)	1m 36s
test-dbt-versions (1.7)	1m 32s
test-dbt-versions (1.5)	1m 36s
test-dbt-versions (1.9)	1m 42s
test-dbt-versions (1.4)	1m 29s
test-dbt-versions (1.6)	1m 37s
changes	7s
test-dbt-versions (1.3)	1m 41s
test-dbt-versions (1.10)	1m 48s
test-vscode	0s
test-vscode-e2e	-1s
migration-test	1m 30s
cicd-tests-windows	12m 4s
style-and-cicd-tests (3.9)	23m 8s
doc-tests	37s
style-and-cicd-tests (3.13)	21m 12s
style-and-cicd-tests (3.10)	23m 11s
engine-tests-docker (clickhouse)	2m 55s
engine-tests-docker (mssql)	1m 54s
engine-tests-docker (duckdb)	1m 42s
engine-tests-docker (spark)	5m 21s
engine-tests-docker (risingwave)	2m 52s
style-and-cicd-tests (3.12)	24m 2s
engine-tests-docker (mysql)	1m 41s
engine-tests-docker (trino)	9m 18s
engine-tests-docker (postgres)	2m 36s
style-and-cicd-tests (3.11)	19m 17s
ui-test	0s
ui-style	0s
engine-tests-cloud	0s
	2h 46m 27s

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