feat: support generate primary and public key for sshd

[sophon-zt]

e.g:

config tpl:

{{- $key := sshKeyGen }}
PRIVATE_KEY="{{ $key.PrivateKey }}"
PUBLIC_KEY="{{ $key.PublicKey }}"

cmpd:

  configs:
    - name: sshkey-env
      templateRef: ssh-env-tpl
      injectEnvTo:
        - xxxx

[codecov]

Codecov Report

Attention: Patch coverage is 73.91304% with 6 lines in your changes missing coverage. Please review.

Project coverage is 62.61%. Comparing base (400d86d) to head (83f45a7).
Report is 10 commits behind head on main.

Files	Patch %	Lines
pkg/gotemplate/sshkeygenerator.go	72.72%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8002      +/-   ##
==========================================
+ Coverage   62.55%   62.61%   +0.05%     
==========================================
  Files         324      325       +1     
  Lines       40221    40244      +23     
==========================================
+ Hits        25161    25197      +36     
+ Misses      12762    12753       -9     
+ Partials     2298     2294       -4     

Flag	Coverage Δ
unittests	62.61% <73.91%> (+0.05%)	⬆️

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[sophon-zt]

/cherry-pick release-0.9

[github-actions]

🤖 says: Error cherry-picking.

Auto-merging go.mod
CONFLICT (content): Merge conflict in go.mod
Auto-merging go.sum
CONFLICT (content): Merge conflict in go.sum
error: could not apply 83cfbf0... feat: support generate primary and public key for sshd (#8002)
hint: After resolving the conflicts, mark them with
hint: "git add/rm ", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".
hint: Disable this message with "git config advice.mergeConflict false"

[github-actions]

🤖 says: ‼️ cherry pick action failed.
See: https://github.com/apecloud/kubeblocks/actions/runs/10703072257