sql: log session variable settings that are set in the connection string

[lyang24]

This commit logs session variables passed on the connection url. The goal is to provide more information on trouble shooting issues. The output could be redacted for security purpose.

Fixes: #122934

Release note: None

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I have added a few people who may be able to assist in reviewing:

• @rafiss (author of cockroachdb/cockroach#122934)

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[cockroach-teamcity]

This change is 

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[craig[bot]]

Build succeeded:

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[blathers-crl[bot]]

Encountered an error creating backports. Some common things that can go wrong:

1. The backport branch might have already existed.
2. There was a merge conflict.
3. The backport branch contained merge commits.

You might need to create your backport manually using the backport tool.

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error creating merge commit from acf7af8c62464674ed06883951a6f89cf22b0af8 to blathers/backport-release-23.1-123015: POST https://api.github.com/repos/cockroachdb/cockroach/merges: 409 Merge conflict []

you may need to manually resolve merge conflicts with the backport tool.

Backport to branch 23.1.x failed. See errors above.

---

error creating merge commit from acf7af8c62464674ed06883951a6f89cf22b0af8 to blathers/backport-release-23.2-123015: POST https://api.github.com/repos/cockroachdb/cockroach/merges: 409 Merge conflict []

you may need to manually resolve merge conflicts with the backport tool.

Backport to branch 23.2.x failed. See errors above.

---

error setting reviewers, but backport branch blathers/backport-release-24.1-123015 is ready: POST https://api.github.com/repos/cockroachdb/cockroach/pulls/124446/requested_reviewers: 422 Reviews may only be requested from collaborators. One or more of the teams you specified is not a collaborator of the cockroachdb/cockroach repository. []

Backport to branch 24.1.x failed. See errors above.

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