fix: missing dependabot updates

Problem:
Since ebe7d3c, dependabot does not send
updates for packages not matching a group. For example, in the
"telemetry/vscode/" directory it will only update `jest` and `@types`
dependencies. Other deps won't be updated.

Hint: #533 (comment)

Solution:
- Review the inscrutable documentation: https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
- Reference examples on github via: https://github.com/search?q=path%3Adependabot.yml+groups+all&type=code
- Remove `dependency-type` directive.
- Try `allow: dependency-name: '*'` directive.
    - If this doesn't work, later try a "catch-all" group. Note that `groups` are evaluated as "first wins".
- Note: intentionally _not_ using ["allow … all" directive](https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#allow);
  it enables updates for _transitive_ dependencies, it's unrelated to "groups":
  ```
  allow:
    - dependency-type: 'all'
  ```

.github/dependabot.yml

@@ -1,42 +1,55 @@
-# Please see the documentation for all configuration options:
-# https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+# Documentation for configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
 # https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/about-dependabot-version-updates
 
 version: 2
 updates:
     - package-ecosystem: 'npm'
       target-branch: 'main' # Avoid updates to "staging".
+      commit-message:
+          prefix: 'deps'
       directory: '/telemetry/vscode'
       schedule:
           interval: 'daily'
+      allow:
+          - dependency-name: '*'
       groups:
           jest:
-              dependency-type: 'development'
               patterns:
                   - '*jest'
           types:
-              dependency-type: 'development'
               patterns:
                   - '@types/*'
+          # other: # Catch-all to ensure dependabot updates other dependencies...
+          #     patterns:
+          #         - '*'
 
     - package-ecosystem: 'gradle'
       target-branch: 'main' # Avoid updates to "staging".
+      commit-message:
+          prefix: 'deps'
       directory: '/telemetry/jetbrains'
       schedule:
           interval: 'daily'
 
     - package-ecosystem: 'nuget'
       target-branch: 'main' # Avoid updates to "staging".
+      commit-message:
+          prefix: 'deps'
       directory: '/telemetry/csharp'
       schedule:
           interval: 'daily'
+      allow:
+          - dependency-name: '*'
       groups:
           xunit:
-              dependency-type: 'development'
               patterns:
                   - 'xunit'
                   - 'xunit.runner.visualstudio'
                   - 'xunit*'
                   - 'xunit.*'
               update-types:
                   - 'minor'
+          # other: # Catch-all to ensure dependabot updates other dependencies...
+          #     patterns:
+          #         - '*'