test(path_generator): add tests for path_generator

[mitukou1109]

Description

This PR adds tests for the node interface and utility functions in the autoware_path_generator package.

How was this PR tested?

colcon test --packages-select autoware_path_generator --event-handlers console_cohesion+

gives the following result:

1: [==========] Running 6 tests from 2 test suites.
1: [----------] Global test environment set-up.
1: [----------] 1 test from PlanningModuleInterfaceTest
1: [ RUN      ] PlanningModuleInterfaceTest.NodeTestWithExceptionTrajectory
1: [ERROR] [1733300119.198900944] [path_generator]: input route is empty, ignoring...
1: [       OK ] PlanningModuleInterfaceTest.NodeTestWithExceptionTrajectory (1694 ms)
1: [----------] 1 test from PlanningModuleInterfaceTest (1694 ms total)
1: 
1: [----------] 5 tests from PathGeneratorUtilsTest
1: [ RUN      ] PathGeneratorUtilsTest.getPreviousLaneletWithinRoute
1: [       OK ] PathGeneratorUtilsTest.getPreviousLaneletWithinRoute (55 ms)
1: [ RUN      ] PathGeneratorUtilsTest.getNextLaneletWithinRoute
1: [       OK ] PathGeneratorUtilsTest.getNextLaneletWithinRoute (48 ms)
1: [ RUN      ] PathGeneratorUtilsTest.getLaneletsWithinRouteUpTo
1: [       OK ] PathGeneratorUtilsTest.getLaneletsWithinRouteUpTo (51 ms)
1: [ RUN      ] PathGeneratorUtilsTest.getLaneletsWithinRouteAfter
1: [       OK ] PathGeneratorUtilsTest.getLaneletsWithinRouteAfter (49 ms)
1: [ RUN      ] PathGeneratorUtilsTest.getLaneletsWithinRoute
1: [       OK ] PathGeneratorUtilsTest.getLaneletsWithinRoute (49 ms)
1: [----------] 5 tests from PathGeneratorUtilsTest (252 ms total)
1: 
1: [----------] Global test environment tear-down
1: [==========] 6 tests from 2 test suites ran. (1946 ms total)
1: [  PASSED  ] 6 tests.

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

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[mitukou1109]

I will close this PR since the package has been moved to autoware.core.