feat: migrate to ng v15

[anandtiwary]

Description

Please include a summary of the change, motivation and context.

Testing

Please describe the tests that you ran to verify your changes. Please summarize what did you test and what needs to be tested e.g. deployed and tested helm chart locally.

Checklist:

• [ ] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] Any dependent changes have been merged and published in downstream modules

Documentation

Make sure that you have documented corresponding changes in this repository or hypertrace docs repo if required.

[github-actions[bot]]

Unit Test Results

0 files   -        4  0 suites   - 304   0s :stopwatch: - 41m 40s 0 tests  - 1 093  0 :heavy_check_mark:  - 1 093  0 :zzz: ±0  0 :x: ±0  0 runs   - 1 101  0 :heavy_check_mark:  - 1 101  0 :zzz: ±0  0 :x: ±0 

Results for commit d5425e1b. ± Comparison against base commit 69e7af1b.