fix(lsp): read self.context_state instead of stale local variable in _context_get_or_load #3710

Job	Run time
test-dbt-versions (1.7)	1m 44s
test-dbt-versions (1.4)	1m 25s
test-dbt-versions (1.6)	1m 31s
test-dbt-versions (1.3)	1m 41s
test-dbt-versions (1.9)	1m 41s
changes	6s
test-dbt-versions (1.10)	1m 45s
test-dbt-versions (1.8)	1m 43s
test-dbt-versions (1.5)	1m 34s
test-vscode	0s
test-vscode-e2e	0s
migration-test	1m 34s
doc-tests	36s
cicd-tests-windows	12m 22s
style-and-cicd-tests (3.10)	23m 11s
style-and-cicd-tests (3.13)	21m 54s
style-and-cicd-tests (3.9)	23m 22s
style-and-cicd-tests (3.12)	22m 55s
style-and-cicd-tests (3.11)	23m 21s
engine-tests-docker (postgres)	2m 12s
engine-tests-docker (trino)	8m 6s
engine-tests-docker (duckdb)	1m 41s
engine-tests-docker (spark)	5m 6s
engine-tests-docker (mssql)	1m 45s
engine-tests-docker (mysql)	1m 46s
engine-tests-docker (risingwave)	2m 43s
engine-tests-docker (clickhouse)	2m 44s
ui-style	0s
ui-test	0s
engine-tests-cloud	0s
	2h 48m 28s

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