remove bug: prefix in issues (#5962)

Originally, I added the `bug:` prefix to help categorize different types
of issues like features, feedback, etc. But now that the repo is bugs
only, we don't need this prefix.

Also changing the label from `clients/vscode` to `repo/cody` to help
distinguish where this issue originated from when we sync back to linear

## Test plan
N/A
<!-- Required. See
https://docs-legacy.sourcegraph.com/dev/background-information/testing_principles.
-->

## Changelog

<!-- OPTIONAL; info at
https://www.notion.so/sourcegraph/Writing-a-changelog-entry-dd997f411d524caabf0d8d38a24a878c
-->

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -1,11 +1,9 @@
 name: Bug report (VS Code)
-description: File a bug report to help us improve
-title: 'bug: '
+description: File a bug report to help us improve the VS Code plugin
+title: ''
 labels:
   - bug
-  - clients/vscode
-projects:
-  - sourcegraph/387
+  - repo/cody
 body:
   - type: markdown
     attributes:

vscode/src/services/utils/issue-reporter.ts

@@ -7,7 +7,7 @@ export function openCodyIssueReporter() {
     void vscode.commands.executeCommand('workbench.action.openIssueReporter', {
         extensionId: `${packageJson.publisher}.${packageJson.name}`,
         issueBody,
-        issueTitle: 'bug: ',
+        issueTitle: '',
     })
 }