[Release-1.25] Handle nil pointer when runtime core is not ready in etcd

[vitorsavian]

Proposed Changes

Types of Changes

• Backport from - Handle nil pointer when runtime core is not ready in etcd #8886

Verification

Testing

Linked Issues

• [RFE] Mechanism to easily determine etcd node health/voter status #8033
• Add etcd status condition #8724

User-Facing Change

Further Comments

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (5568a2e) 17.27% compared to head (fb73de0) 17.27%.

Files	Patch %	Lines
pkg/etcd/etcd.go	0.00%	9 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.25    #8889      +/-   ##
================================================
- Coverage         17.27%   17.27%   -0.01%     
================================================
  Files                93       93              
  Lines              6397     6398       +1     
================================================
  Hits               1105     1105              
- Misses             5059     5060       +1     
  Partials            233      233              

Flag	Coverage Δ
unittests	17.27% <0.00%> (-0.01%)	⬇️

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