fix: typo in gu post-install actions

- fix: `startsWith` should be `startswith`
- test: update `components-ce` test to include component usage

Thank you to @mantasindrasius!

Co-authored-by: Mantas Indrašius <mantasi@wix.com>
Signed-off-by: Sam Gammon <sam@elide.ventures>

internal/graalvm_bindist.bzl

@@ -110,7 +110,7 @@ def _graal_postinstall_actions(ctx, os):
     cmd = _graal_updater_path(ctx, os)
     if ctx.attr.setup_actions and len(ctx.attr.setup_actions) > 0:
         for action in ctx.attr.setup_actions:
-            if not action.startsWith("gu "):
+            if not action.startswith("gu "):
                 fail("GraalVM setup action did not start with 'gu'. Please only run GraalVM updater commands.")
 
             action_cmd = action.replace("gu ", "").split(" ")