Refactor tests-changed report to utilize length helper for improved readability and maintainability

Author: Ma11hewThomas

dist/reports/tests-changed-table.hbs

@@ -1,7 +1,7 @@
-{{#if (and report.insights.extra.testsAdded report.insights.extra.testsRemoved (or (gt report.insights.extra.testsAdded.length 0) (gt report.insights.extra.testsRemoved.length 0)))}}
-**{{report.insights.extra.testsAdded.length}} new test{{#if (gt report.insights.extra.testsAdded.length 1)}}s{{/if}} added, {{report.insights.extra.testsRemoved.length}} removed**
+{{#if (and report.insights.extra.testsAdded report.insights.extra.testsRemoved (or (gt (length report.insights.extra.testsAdded) 0) (gt (length report.insights.extra.testsRemoved) 0)))}}
+**{{length report.insights.extra.testsAdded}} new test{{#if (gt (length report.insights.extra.testsAdded) 1)}}s{{/if}} added, {{length report.insights.extra.testsRemoved}} removed**
 
-{{#if (gt report.insights.extra.testsAdded.length 0)}}
+{{#if (gt (length report.insights.extra.testsAdded) 0)}}
 ### Added ➕
 
 | **Name** | **Suite** |
@@ -11,7 +11,7 @@
 {{/each}}
 {{/if}}
 
-{{#if (gt report.insights.extra.testsRemoved.length 0)}}
+{{#if (gt (length report.insights.extra.testsRemoved) 0)}}
 ### Removed ➖
 
 | **Name** | **Suite** |