Update grafana dashboards

[mthede]

Related Issue

Closes #762, #763 #761, #796

Description

• grafana: include storage dispatch in market results by technology plot #796: Plot for market results on main dashboard now includes dispatch for both directions (generation, loads), with exchange and storage units
• grafana: Improve Merit Order Visualization #763: Improved merit order plot and added slider to change period of interest without needing to adjust the whole horizon
• Learning Dashboard: add slider to change episode of interest faster and see progression of rewards and actions

Checklist

• Documentation updated (docstrings, READMEs, user guides, inline comments, doc folder updates etc.)
• New unit/integration tests added (if applicable)
• Changes noted in release notes (if any)
• Consent to release this PR's code under the GNU Affero General Public License v3.0

PR Specific Checklist

• Multi-market example working ("small" and "small_dam")

Additional Notes (optional)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.51%. Comparing base (656d8c8) to head (d7c74fb).
⚠️ Report is 74 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #799      +/-   ##
==========================================
- Coverage   81.85%   80.51%   -1.35%     
==========================================
  Files          55       56       +1     
  Lines        8290     9013     +723     
==========================================
+ Hits         6786     7257     +471     
- Misses       1504     1756     +252     

Flag	Coverage Δ
pytest	80.51% <ø> (-1.35%)	⬇️

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[jvgkr]

The merit order plot is displaying unexpected visual artifacts. Investigation needed to determine the root cause before applying a fix.