Fix RepositoryServer datamover tests

[r4rajat]

Change Overview

Refactored following

• Delete whole namespace instead of individual resources in cleanup
• Setting Environmental Variables for the repo-server container via secrets instead directly

Pull request type

Please check the type of change your PR introduces:

• 🚧 Work in Progress
• 🌈 Refactoring (no functional changes, no api changes)
• 🐹 Trivial/Minor
• 🐛 Bugfix
• 🌻 Feature
• 🗺️ Documentation
• 🤖 Test

Issues

• fixes #issue-number

Test Plan

$ make install-minio

$ export S3_COMPLIANT_AWS_ACCESS_KEY_ID="AKIAIOSFODNN7EXAMPLE"
$ export S3_COMPLIANT_AWS_SECRET_ACCESS_KEY="wJad@9gkeFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY"
$ export S3_COMPLIANT_LOCATION_ENDPOINT="http://minio.minio.svc.cluster.local:9000"

$ cd pkg/datamover

$ go test

...
...
...
...
OK: 2 passed
PASS
ok      github.com/kanisterio/kanister/pkg/datamover    16.737s

• 💪 Manual
• ⚡ Unit test
• 💚 E2E

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[pavannd1]

Possible race in the test. This could potentially cause flaky failures.

----------------------------------------------------------------------
FAIL: repositoryserver_controller_test.go:208: RepoServerControllerSuite.TestRepositoryServerImmutability

repositoryserver_controller_test.go:230:
    c.Assert(err.Error(), Equals, expectedErrorMessage)
... obtained string = "Operation cannot be fulfilled on repositoryservers.cr.kanister.io \"test-kopia-repo-server-6j9hk\": the object has been modified; please apply your changes to the latest version and try again"
... expected string = "RepositoryServer.cr.kanister.io \"test-kopia-repo-server-6j9hk\" is invalid: spec.repository.rootPath: Invalid value: \"string\": Value is immutable"