Separate apiGroup for mutating and validating webhook

[the-redback]

• Separate apiGroup for mutating and validating webhook
• Both name and namespace required for snapshotInit
• Skip Handling Snapshot Items of DOrmantDB in case of Redis and Memcached.

[codecov-io]

Codecov Report

Merging #217 into master will increase coverage by 0.36%.
The diff coverage is 37.5%.

@@            Coverage Diff             @@
##           master     #217      +/-   ##
==========================================
+ Coverage   33.15%   33.51%   +0.36%     
==========================================
  Files           3        3              
  Lines         365      367       +2     
==========================================
+ Hits          121      123       +2     
  Misses        212      212              
  Partials       32       32

Impacted Files	Coverage Δ
pkg/admission/snapshot/admission.go	42.22% <0%> (ø)	⬆️
pkg/admission/dormantdatabase/admission.go	28.3% <41.37%> (+0.54%)	⬆️

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