fix: fix label test and activity data

[frank-zsy]

This PR fixes:

• The merge logic for injected label data to make sure it works for new label data schema.
• The testdata for activity and bus factor due to the weights change in #1443
• Add test directory to tsconfig.ts file to make sure the test files are also compiled so we can check the test files too.
• Remove charset option in tsconfig.ts file which is already deprecated.