[improve][test]Support test metadatastore of etcd with url and not testcontainers

[liangyuanpeng]

Fixes #21252

Main Issue: #xyz

PIP: #xyz

Motivation

Support test metadatastore of etcd with url and not testcontainers

Mainly I hope to test the metadata store etcd without a docker environment.

Modifications

Add a properties of pulsar.metadatastore.etcd.url for run metadata store etcd test.

Verifying this change

• Make sure that the change passes the CI checks.

(Please pick either of the following options)

This change is a trivial rework / code cleanup without any test coverage.

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This change is already covered by existing tests, such as (please describe tests).

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This change added tests and can be verified as follows:

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• Added integration tests for end-to-end deployment with large payloads (10MB)
• Extended integration test for recovery after broker failure

Does this pull request potentially affect one of the following parts:

If the box was checked, please highlight the changes

• Dependencies (add or upgrade a dependency)
• The public API
• The schema
• The default values of configurations
• The threading model
• The binary protocol
• The REST endpoints
• The admin CLI options
• The metrics
• Anything that affects deployment

Documentation

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[nodece]

The @Cleanup should call the close(), which seems to cause the etcd cluster to shutdown after calling the getEtcdClusterConnectString().

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