proxy: use a real proxy conn id

[xhebox]

What problem does this PR solve?

Issue Number: close #345

Problem Summary: Pass a real connection id.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Notable changes

• Has configuration change
• Has HTTP API interfaces change
• Has tiproxyctl change
• Other user behavior changes

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[djshow832]

Add test to verify the conn ID changes

[djshow832]

/retest

[ti-chi-bot]

@xhebox: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-integration-sequelize-test	2668341	link	true	/test pull-integration-sequelize-test
pull-integration-prisma-test	2668341	link	true	/test pull-integration-prisma-test
pull-integration-ruby-orm-test	2668341	link	true	/test pull-integration-ruby-orm-test

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: djshow832

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [djshow832]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-08-30 06:25:46.305509206 +0000 UTC m=+1908310.854525190: ☑️ agreed by djshow832.