HDDS-9993. Add static import for assertions and mocks in hdds-server-scm

[raju-balpande]

What changes were proposed in this pull request?

Add static import for assertions and mocks in hadoop-hdds/server-scm.
he goal of this task is to add import static for all assertions and interactions with mocks. Replacing:

Assertions.assert(...) -> assert(...)
Assertions.fail(...) -> fail(...)

and

Mockito.mock(...) -> mock(...)
Mockito.verify(...) -> verify(...)
Mockito.when(...) -> when(...)
...

and

ArgumentMatchers.any() -> any()
ArgumentMatchers.eq() -> eq()
ArgumentMatchers.matches() -> matches()
// also:
// Matchers.<...>()

• makes the code more readable (shorter lines, less wrapping).
• Corrected argument sequence at some places in assertEquals to expected, actual.
• Modified try{ fail() ) catch to assertThrows for the suitable cases.

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-9993

How was this patch tested?

Tested the test cases in CI-CD pipeline.