DEVED-14117: Rename ECA prompt for consistency and update PR template

[farah-aly]

Description of change

This PR renames ECA prompt for consistency and updates PR template.

Type of Change

Please select the options that are relevant:

• New prompt
• Prompt improvement (non-breaking)
• Prompt refactor (breaking change)
• Documentation update
• Bug fix
• Other (please describe):

Prompts affected

• Simplify Jargon prompt
• Generate Alt Text prompt
• Auto Edit Document prompt
• Generate Metadata prompt
• Update the Error Code Documentation prompt

Testing checklist

For prompt changes

• The prompt follows the schema defined in prompt.schema.json
• The prompt includes at least 2-3 examples showing expected inputs and outputs
• The prompt includes evaluation notes for edge cases and failure modes
• I have tested the prompt with the recommended models
• The version has been updated according to semantic versioning guidelines

Prompt test results

Example input:
[Input text here]

Example output:
[Output text here]

Definition of done

Documentation and deployment readiness

• I have read the CONTRIBUTING.md guidelines
• I updated README.md if needed
• I added a release note if applicable

Status and merge options

• I converted my PR to draft because I'm still working on this PR
• I enabled auto-merge (squash) for my PR

[bermudezmt]

LGTM!