Add workspaceSymbols.includeCommentSections setting (#8419)

Branched from #8412

For #4886
Extension side of posit-dev/ark#866

Can be merged separately.

Author: lionel-

extensions/positron-r/package.json

@@ -194,6 +194,11 @@
             "type": "boolean",
             "default": false,
             "description": "%r.configuration.symbols.includeAssignmentsInBlocks.description%"
+          },
+          "positron.r.workspaceSymbols.includeCommentSections": {
+            "type": "boolean",
+            "default": false,
+            "description": "%r.configuration.workspaceSymbols.includeCommentSections.description%"
           }
         }
       },

extensions/positron-r/package.nls.json

@@ -65,6 +65,7 @@
 	"r.configuration.pipe.magrittr.description": "Pipe operator from the magrittr package, re-exported by many other packages",
 	"r.configuration.diagnostics.enable.description": "Enable R diagnostics globally",
 	"r.configuration.symbols.includeAssignmentsInBlocks.description": "Controls whether assigned objects inside `{}` blocks are included as document symbols, in addition to top-level assignments. Reopen files or restart the server for the setting to take effect.",
+	"r.configuration.workspaceSymbols.includeCommentSections.description": "Controls whether comment sections like `# My section ---` are included as workspace symbols.",
 	"r.configuration.defaultRepositories.description": "The default repositories to use for R package installation, if no repository is otherwise specified in R startup scripts (restart Positron to apply).\n\nThe default repositories will be set as the `repos` option in R.",
 	"r.configuration.defaultRepositories.auto.description": "Automatically choose a default repository, or use a repos.conf file if it exists.",
 	"r.configuration.defaultRepositories.rstudio.description": "Use the RStudio CRAN mirror (cran.rstudio.com)",