Improve Dockerfile robustness

[vincentmr]

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---

Context:
When PennyLane lags Lightning, like around release dates, there is a possibility that Docker images for Lightning will be built before PennyLane is release and hence the versions mismatch.

Description of the Change:
Add PENNYLANE_VERSION build arg.
Remove dependency on requirement files and install only deps that are needed.

Benefits:

Possible Drawbacks:

Related GitHub Issues:
[sc-63094]

[github-actions]

Hello. You may have forgotten to update the changelog!
Please edit .github/CHANGELOG.md with:

• A one-to-two sentence description of the change. You may include a small working example for new features.
• A link back to this PR.
• Your name (or GitHub username) in the contributors section.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.72%. Comparing base (d9da016) to head (268aaed).
Report is 92 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #722      +/-   ##
==========================================
+ Coverage   92.73%   97.72%   +4.98%     
==========================================
  Files          92       68      -24     
  Lines       13777     9309    -4468     
==========================================
- Hits        12776     9097    -3679     
+ Misses       1001      212     -789     

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[vincentmr]

Seems to work well now (test)

[maliasadi]

Nice work @vincentmr! Don't forget to update the changelog.