feat: add new samples for bigquery

[vishwarajanand]

Adding samples which are missing on these pages:

bigquery_query_dry_run -> https://cloud.google.com/bigquery/docs/dry-run-queries
bigquery_query_no_cache -> https://cloud.google.com/bigquery/docs/cached-results

Tests:

Passes in my local

➜  api git:(bigquery_samples) XDEBUG_MODE=coverage ../../testing/vendor/bin/phpunit --verbose -c phpunit.xml.dist test/*
PHPUnit 8.5.27 #StandWithUkraine

Runtime:       PHP 7.3.33 with Xdebug 3.1.5
Configuration: /usr/local/google/home/vishwarajanand/github/php-docs-samples/bigquery/api/phpunit.xml.dist
Error:         This version of PHPUnit does not support code coverage on PHP 8

.......................                                           23 / 23 (100%)

Time: 1.73 minutes, Memory: 58.00 MB

OK (23 tests, 64 assertions)
➜  api git:(bigquery_samples) 

[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• bigquery/api/src/dry_run_query.php:32, tag bigquery_query_dry_run
• bigquery/api/src/query_no_cache.php:32, tag bigquery_query_no_cache

---

This comment is generated by snippet-bot.
If you find problems with this result, please file an issue at:
https://github.com/googleapis/repo-automation-bots/issues.
To update this comment, add snippet-bot:force-run label or use the checkbox below:

• Refresh this comment

[vishwarajanand]

Let me know reviewers if I should fix the lint failures as well.. they seem unrelated to my changes.

[bshaffer]

@vishwarajanand unfortunately we need to fix the lint issues before we merge this PR, so if you're able to look into them that'd be great. The same is true for the PHP 7.3 failures.

Edit: I've fixed the CS issues here: #1658

[bshaffer]

minor changes only. Otherwise, I can approve this once the tests are passing