update to using the SSA-enabled generation of the bundled NSTemplateTiers

[metlos]

This is because of the change in toolchain-common that changed the signature of EnsureObject so that it is usable with the SSA client.

Related PRs:

• toolchain-common: Simplify nstemplatetiers.GenerateTiers codeready-toolchain/toolchain-common#486
• host-operator: Deploy the bundled NSTemplateTiers using SSA codeready-toolchain/host-operator#1185
• toolchain-e2e: add tests to ensure that the bundled resources are deployed using SSA codeready-toolchain/toolchain-e2e#1169

JIRA: https://issues.redhat.com/browse/SANDBOX-1339

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 70.54%. Comparing base (6c22f5f) to head (80e416b).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/cmd/generate/nstemplatetiers.go	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #119   +/-   ##
=======================================
  Coverage   70.54%   70.54%           
=======================================
  Files          56       56           
  Lines        4013     4013           
=======================================
  Hits         2831     2831           
  Misses        958      958           
  Partials      224      224           

Files with missing lines	Coverage Δ
pkg/cmd/generate/nstemplatetiers.go	53.73% <66.66%> (ø)

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