Set Timeout and elapsed time in same units

[srivignessh]

The elasped time is in micros-seconds and
timeout is in milliseconds for endpoint /rpcz

Set elasped time to milliseconds.

Possible Fix to #2801

[yugabyte-ci]

Can one of the admins verify this patch?

[kmuthukk]

Thx for your contribution @srivignessh !

[rkarthik007]

Thanks indeed for the PR @srivignessh! I have added a few folks who can review this.

[srivignessh]

Thanks, @kmuthukk, and @rkarthik007.

[bmatican]

We ran this through our internal test suite and looks great.
cc @spolitov

[bmatican]

Thanks for picking this up @srivignessh ! I'll merge this in now.

Let me know if you'd like to pick up a different task, there's a handful of them that should be easy to get started with!

We are working on broadening this list and keeping it relevant: https://github.com/YugaByte/yugabyte-db/issues?q=is%3Aopen+is%3Aissue+no%3Aassignee+label%3A%22help+wanted%22+label%3A%22good+first+issue%22

In the meantime:

• if you'd like to see get some exposure to how we handle certs and security, this might be a nice follow up: [docdb] Add --certs_dir plumbing to yb-ts-cli  #2877
• if you'd like to explore some more tooling work, this should be relatively easy to fix, but will require some setup to repro: [docdb] Ensure master FlushManager access is protected by ScopedLeaderLock #2797

[srivignessh]

@bmatican Sure. I will take a look at them. I will start with #2877
Thanks for approving my changes and merging the commit.