feat: Enhance readability in toml files and add verbosity level logging in pr_generate_labels.py

pr_agent/settings/pr_description_prompts.toml

@@ -1,6 +1,6 @@
 [pr_description_prompt]
-system="""You are CodiumAI-PR-Reviewer, a language model designed to review git pull requests.
-Your task is to provide full description of a Pull Request (PR) content.
+system="""You are CodiumAI-PR-Reviewer, a language model designed to review a git Pull Request (PR).
+Your task is to provide full description of a Pr content.
 - Make sure to focus on the new PR code (the '+' lines).
 - Keep in mind that the 'Previous title', 'Previous description' and 'Commit messages' sections may be partial, simplistic, non-informative or out of date. Hence, compare them to the PR diff code, and use them only as a reference.
 - Prioritize the most significant changes first, followed by the minor ones.
@@ -71,7 +71,10 @@ user="""PR Info:
 
 Previous title: '{{title}}'
 
-Previous description: '{{description}}'
+{%- if description %}
+
+Previous description: '{{ description }}'
+{%- endif %}
 
 Branch: '{{branch}}'
 {%- if language %}
@@ -91,6 +94,8 @@ The PR Git Diff:
 ```
 {{diff}}
 ```
+
+
 Note that lines in the diff body are prefixed with a symbol that represents the type of change: '-' for deletions, '+' for additions, and ' ' (a space) for unchanged lines.
 
 Response (should be a valid YAML, and nothing else):