Fix website not loading on Safari

It's caused by lookahead regex used in dash comment regex for inlining
PowerShell. This commit changes dash comment inlining.

- Change regex to one without lookahead.
- Add more test cases for inlining dash comment in tricky situations.
- Refactor makeInlineComment to be it's own function to easily test
  other regex options.
- Document all regex alternatives.
- Remove redundant null check (`||`) with adding safe navigation
  operator  (`?`) to allow variable before check to be null instead of
  throwing exception.

tests/unit/application/Parser/Script/Compiler/Expressions/Pipes/PipeDefinitions/InlinePowerShell.spec.ts

@@ -283,7 +283,7 @@ function getCommentCases(): IPipeTestCase[] {
             ),
         },
         {
-            name: 'can convert comment with inline comment parts',
+            name: 'can convert comment with inline comment parts inside',
             input: getWindowsLines(
                 '$text+= #Comment with < inside',
                 '$text+= #Comment ending with >',
@@ -295,14 +295,28 @@ function getCommentCases(): IPipeTestCase[] {
                 '$text+= <# Comment with <# inline comment #> #>',
             ),
         },
+        {
+            name: 'can convert comment with inline comment parts around', // Pretty uncommon
+            input: getWindowsLines(
+                'Write-Host "hi" # Comment ending line inline comment but not one #>',
+                'Write-Host "hi" #>Comment starting like inline comment end but not one',
+                // Following line does not compile as valid PowerShell referring to missing #> for inline comment
+                'Write-Host "hi" <#Comment starting like inline comment start but not one',
+            ),
+            expectedOutput: getSingleLinedOutput(
+                'Write-Host "hi" <# Comment ending line inline comment but not one #> #>',
+                'Write-Host "hi" <# >Comment starting like inline comment end but not one #>',
+                'Write-Host "hi" <<# Comment starting like inline comment start but not one #>',
+            ),
+        },
         {
             name: 'converts empty hash comment',
             input: getWindowsLines(
-                'Write-Host "Lorem ipsus" #',
+                'Write-Host "Comment without text" #',
                 'Write-Host "Non-empty line"',
             ),
             expectedOutput: getSingleLinedOutput(
-                'Write-Host "Lorem ipsus" <##>',
+                'Write-Host "Comment without text" <##>',
                 'Write-Host "Non-empty line"',
             ),
         },
@@ -318,7 +332,7 @@ function getCommentCases(): IPipeTestCase[] {
             ),
         },
         {
-            name: 'trims whitespaces around from match',
+            name: 'trims whitespaces around comment',
             input: getWindowsLines(
                 '#      Comment with whitespaces around       ',
                 '#\tComment with tabs around\t\t',