Restore system-test fixes lost in merge.

* test: change compliance test rerun condition regex string

* try sys test

* add sleep to time

* change exceed rate limit code to 400

* change rerun condition format

* delete compliance tests to make it faster

* stop on first fail

* add rerun condition

* change rerun condition format

* add back the deleted tests

* remove investigation changes and add owlbot change

* black

* revert README

* chore: Update gapic-generator-python to 1.23.6

PiperOrigin-RevId: 738170370

Source-Link: googleapis/googleapis@3f1e17a

Source-Link: googleapis/googleapis-gen@9afd8c3
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiOWFmZDhjMzNkNGNhZTYxMGI3NWZhNDk5OTI2NGVhOGM4YzY2YjlkMiJ9

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

* chore: Update gapic-generator-python to 1.23.6

PiperOrigin-RevId: 738170370

Source-Link: googleapis/googleapis@3f1e17a

Source-Link: googleapis/googleapis-gen@9afd8c3
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiOWFmZDhjMzNkNGNhZTYxMGI3NWZhNDk5OTI2NGVhOGM4YzY2YjlkMiJ9

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

* fix: Rename aws imdsv2 url field and update token lifetime

* update readme

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

…gs (#983)

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:
- [ ] Make sure to open an issue as a [bug/issue](https://github.com/googleapis/python-bigquery/issues/new/choose) before writing your code!  That way we can discuss the change, evaluate designs, and agree on the general idea
- [ ] Ensure the tests and linter pass
- [ ] Code coverage does not decrease (if any source code was changed)
- [ ] Appropriate docs were updated (if necessary)

Fixes #981 
Fixes #982
Towards googleapis/python-bigquery-pandas#387
🦕

* docs: fix c.g.c structure

* docs: make docs job happy