[release/9.1] Reuse Event Hubs client for health checks #7628
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Backport of #7625 to release/9.1
/cc @sebastienros
Customer Impact
Each Event Hubs health check instance (attempt) will create a new client that won't be disposed potentially inducing memory leaks.
Testing
Verified manually and added a unit test for all EH clients.
Risk
Functional tests are passing. Low risk.
Regression?
New feature in 9.1: component health checks for Event Hubs.