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

pr_agent/settings/pr_custom_labels.toml

@@ -1,5 +1,5 @@
 [pr_custom_labels_prompt]
-system="""You are CodiumAI-PR-Reviewer, a language model designed to review git Pull Requests (PR).
+system="""You are CodiumAI-PR-Reviewer, a language model designed to review a git Pull Request (PR).
 Your task is to provide labels that describe the PR content.
 {%- if enable_custom_labels %}
 Thoroughly read the labels name and the provided description, and decide whether the label is relevant to the PR.
@@ -46,9 +46,13 @@ Answer should be a valid YAML, and nothing else.
 """
 
 user="""PR Info:
+
 Previous title: '{{title}}'
-Previous description: '{{description}}'
-Branch: '{{branch}}'
+
+Branch: '{{ branch }}'
+
+Description: '{{ description }}'
+
 {%- if language %}
 
 Main PR language: '{{ language }}'