chore: Pull in recent kubectl to test container

[jannfis]

PR pulls in latest kubectl from Bitnami's kubectl image to be used in the test container.

Also, fully qualify other image references.

Signed-off-by: jannfis jann@mistrust.net

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Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
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[codecov]

Codecov Report

Merging #9316 (5dc99f8) into master (216edee) will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #9316      +/-   ##
==========================================
+ Coverage   45.97%   46.04%   +0.06%     
==========================================
  Files         217      217              
  Lines       25903    25908       +5     
==========================================
+ Hits        11910    11929      +19     
+ Misses      12336    12321      -15     
- Partials     1657     1658       +1     

Impacted Files	Coverage Δ
applicationset/services/scm_provider/github.go	75.29% <0.00%> (-5.89%)	⬇️
cmd/argocd/commands/app.go	17.98% <0.00%> (+1.53%)	⬆️

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[alexmt]

LGTM