Ensure that createViewSession preserves the trace token

[huw0]

Description

Session.createViewSession creates a new Session that is used when analysing views.

Presently this does not pass through the trace token. This is breaking the use of views with our custom connectors which mandate that this token is populated.

Therefore this is a very simple PR to ensure that the trace token is populated in createViewSession if it is present on the outer session.

Release notes

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## General
* Preserve client trace token in CREATE VIEW ({issue}`25716`)

[ksobolew]

Looks simple enough. Is it possible to add a test?

[dain]

This looks good to me, but if a test is possible, please add that. If not (or really annoying), please let us know, and one of us will merge it as is.

[Praveen2112]

@huw0 For testing I think we could use MockConnectorMetadata which could make use of the trace token at the time of its execution.

[huw0]

I've added some unit testing around createViewSession and rebased the branch.
There seem to be some test failures caused by github rate limiting and some random plugin failures that change every time. Expect these should pass once any wider issues resolve.

[Praveen2112]

Instead of this test - WDYT about #25716 (comment) ?

[huw0]

@Praveen2112 - I've added an additional commit with an alternative test using the approach you've outlined.

---

I've realised that this new test isn't actually hitting the createViewSession code. It looks like this could be done using MockConnectorPlugin as well? But seems that this creates a very bloated test?
I'd be in favour of dropping this 3rd commit and sticking with the first two. The unit test alone increases the existing coverage.

[github-actions]

This pull request has gone a while without any activity. Ask for help on #core-dev on Trino slack.

[huw0]

I'd be in favour of dropping this 3rd commit and sticking with the first two. The unit test alone increases the existing coverage.

@dain @Praveen2112 - Please see comment above. I'd like to get this merged soon if there are no objections?

[github-actions]

This pull request has gone a while without any activity. Ask for help on #core-dev on Trino slack.

[huw0]

Dropped 3rd commit and rebased.

[github-actions]

This pull request has gone a while without any activity. Ask for help on #core-dev on Trino slack.

[github-actions]

Closing this pull request, as it has been stale for six weeks. Feel free to re-open at any time.

[huw0]

PR updated against latest master - but otherwise unchanged.

[huw0]

Thanks @raunaqmorarka for review and merge.