feat(feature-gate, test): set default feature gate values when flag not provided and fix integration tests

[akhilerm]

Why is this PR required? What issue does it fix?:
Currently the default value for all feature flag is false. This changes adds support to change the default value of feature flags

What this PR does?:

• change GPTBasedUUID to default
• fix unit tests
• fix integration tests to support default feature flag
• use common set of yamls for deploying

Does this PR require any upgrade changes?:
No

If the changes in this PR are manually verified, list down the scenarios covered::

Any additional information for your reviewer? :
Mention if this PR is part of any design or a continuation of previous PRs

Checklist:

• Fixes #
• PR Title follows the convention of <type>(<scope>): <subject>
• Has the change log section been updated?
• Commit has unit tests
• Commit has integration tests
• (Optional) Are upgrade changes included in this PR? If not, mention the issue/PR to track:
• (Optional) If documentation changes are required, which issue on https://github.com/openebs/openebs-docs is used to track them:

[codecov-io]

Codecov Report

Merging #536 (b77e1c0) into master (6bfbfe7) will increase coverage by 0.76%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #536      +/-   ##
==========================================
+ Coverage   47.64%   48.41%   +0.76%     
==========================================
  Files          73       73              
  Lines        3373     3371       -2     
==========================================
+ Hits         1607     1632      +25     
+ Misses       1601     1581      -20     
+ Partials      165      158       -7     

Impacted Files	Coverage Δ
pkg/udev/mockdata.go	67.08% <ø> (-0.42%)	⬇️
pkg/features/features.go	100.00% <100.00%> (ø)
cmd/ndm_daemonset/probe/eventhandler.go	38.88% <0.00%> (-3.71%)	⬇️
cmd/ndm_daemonset/probe/smartprobe.go	39.53% <0.00%> (-2.33%)	⬇️
cmd/ndm_daemonset/probe/addhandler.go	74.31% <0.00%> (+3.08%)	⬆️
cmd/ndm_daemonset/probe/udevprobe.go	65.36% <0.00%> (+11.73%)	⬆️

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