Refactor template_test.go to enable an individual run for each test case

[pydctw]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
Previously, the tests in template_test.go were structured in a way that we couldn't run/debug an individual test case.
This PR refactors the tests to enable an individual run and also improve the test output. It will make debugging easier when tests fail.

BEFORE

=== RUN   Test_RenderCloudformation
--- PASS: Test_RenderCloudformation (0.07s)

AFTER

=== RUN   Test_RenderCloudformation
=== RUN   Test_RenderCloudformation/default
=== RUN   Test_RenderCloudformation/with_ssm_secret_backend
=== RUN   Test_RenderCloudformation/with_all_secret_backends
=== RUN   Test_RenderCloudformation/customsuffix
=== RUN   Test_RenderCloudformation/with_bootstrap_user
=== RUN   Test_RenderCloudformation/with_custom_bootstrap_user
=== RUN   Test_RenderCloudformation/with_different_instance_profiles
=== RUN   Test_RenderCloudformation/with_eks_default_roles
=== RUN   Test_RenderCloudformation/with_eks_kms_prefix
=== RUN   Test_RenderCloudformation/with_extra_statements
=== RUN   Test_RenderCloudformation/with_eks_disable
=== RUN   Test_RenderCloudformation/with_eks_console
--- PASS: Test_RenderCloudformation (0.07s)
    --- PASS: Test_RenderCloudformation/default (0.01s)
    --- PASS: Test_RenderCloudformation/with_ssm_secret_backend (0.01s)
    --- PASS: Test_RenderCloudformation/with_all_secret_backends (0.01s)
    --- PASS: Test_RenderCloudformation/customsuffix (0.01s)
    --- PASS: Test_RenderCloudformation/with_bootstrap_user (0.00s)
    --- PASS: Test_RenderCloudformation/with_custom_bootstrap_user (0.01s)
    --- PASS: Test_RenderCloudformation/with_different_instance_profiles (0.01s)
    --- PASS: Test_RenderCloudformation/with_eks_default_roles (0.01s)
    --- PASS: Test_RenderCloudformation/with_eks_kms_prefix (0.01s)
    --- PASS: Test_RenderCloudformation/with_extra_statements (0.01s)
    --- PASS: Test_RenderCloudformation/with_eks_disable (0.00s)
    --- PASS: Test_RenderCloudformation/with_eks_console (0.01s)
PASS

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:
Continue refactoring and improving code base as I encounter items.

Checklist:

• squashed commits
• includes documentation
• adds unit tests
• adds or updates e2e tests

Release note:

NONE

[k8s-ci-robot]

@pydctw: This issue is currently awaiting triage.

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[pydctw]

Verified test outputs from the pipeline runs

• Before
• After

[Ankitasw]

@pydctw I think your IDE will allow to run individual tests.

[sedefsavas]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sedefsavas

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