In this PR we are removing some extra events added for `No session available`  and fixing this event for async transaction runner.

Fixes #<2166> 🦕

Currently the release pipeline is failing. Yesterday the release PR got mergehttps://togithub.com//pull/2180 but it did not trigger the publish release. 

As per offline discussion with @sofisl , this should fix the issue temporarily.

#2190)

* chore(samples): Add samples for Cloud Spanner Default Backup Schedules

* chore(samples): Add samples for Cloud Spanner Default Backup Schedules

* chore(samples): Add samples for Cloud Spanner Default Backup Schedules

* chore(samples): Add samples for Cloud Spanner Default Backup Schedules

* chore(samples): Add samples for Cloud Spanner Default Backup Schedules

* chore(samples): Add samples for Cloud Spanner Default Backup Schedules.
Fix lint issues

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…atchDmlRequest (#2196)

* feat: Add the last statement option to ExecuteSqlRequest and ExecuteBatchDmlRequest

PiperOrigin-RevId: 699218836

Source-Link: googleapis/googleapis@97da65f

Source-Link: googleapis/googleapis-gen@d134e8d
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chore: fix `npm` for samples tests

Source-Link: googleapis/synthtool@4d75242
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This PR contains the code for the newly introduced class `MultiplexedSession`.

This PR includes the same changes as [PR #2191](https://togithub.com/googleapis/nodejs-spanner/pull/2191), which has already been reviewed. The previous PR had to be closed due to restrictions on OwlBot runs, which prevented it from being merged.

* e2eTracing

* context propagation

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* Add end to end tracing header and refactore resource header

* Add end to end tracing header and refactore resource header

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…taleness (#2207)

* chore: integration test fix

* chore: Improve error message for Read-only transaction with bounded staleness

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* review comments

* review comments

* review comment

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…plexed session (#2204)

This PR contains the common interface class SessionFactory which will be responsible for the creation of the Session Pool and the Multiplexed Session(if the env variable would be set to true) upon client initialization.

This PR also contains the getSession method which will return the session(multiplexed/regular) based upon the env variable value.

* chore(main): release 7.17.0

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