Fix get removal mode

[johscheuer]

Description

Before the GetRemovalMode was returning the wrong value.

Fixes: #1750

Type of change

Please select one of the options below.

• Bug fix (non-breaking change which fixes an issue)

Discussion

Testing

Added unit tests for the method.

Documentation

Follow-up

[foundationdb-ci]

Result of fdb-kubernetes-operator-pr on Linux CentOS 7

• Commit ID: b9562e0
• Duration 3:05:35
• Result: ❌ FAILED
• Error: Error while executing command: if $fail_test; then exit 1; fi. Reason: exit status 1
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

[johscheuer]

Summarizing 1 Failure:
  [FAIL] Operator HA Upgrades upgrading a cluster when no remote processes are restarted [It] Upgrade from 6.3.25 to 7.1.31 when no remote processes are restarted [e2e, pr]
  /codebuild/output/src3815948778/src/github.com/FoundationDB/fdb-kubernetes-operator/e2e/test_operator_ha_upgrades/operator_ha_upgrade_test.go:569

The test failure is one that we have to debug, this test is known to be flaky

[foundationdb-ci]

Result of fdb-kubernetes-operator-pr on Linux CentOS 7

• Commit ID: b9562e0
• Duration 2:28:38
• Result: ✅ SUCCEEDED
• Error: N/A
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)