Switch the bug template to a form

Also force people to use one of the templates

Documentation:
https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/syntax-for-issue-forms
PiperOrigin-RevId: 437210882
(cherry picked from commit e11d105)

.github/ISSUE_TEMPLATE/bug.yml

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+name: Bug Report
+description: Report a bug in the ExoPlayer library
+labels: ["bug", "needs triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        We can only process bug reports that are actionable. Unclear bug reports or reports with insufficient information may not get attention.
+
+        Before filing a bug:
+        -------------------------
+
+        - Search existing issues, including issues that are closed: https://github.com/google/ExoPlayer/issues?q=is%3Aissue
+        - Consult our developer website: https://exoplayer.dev/
+        - Check the supported formats: https://exoplayer.dev/supported-formats.html
+  - type: dropdown
+    attributes:
+      label: ExoPlayer Version
+      description: What version of ExoPlayer are you using?
+      options:
+        - 2.17.1
+        - 2.17.0
+        - 2.16.1
+        - 2.16.0
+        - 2.15.1
+        - 2.15.0
+        - 2.14.2
+        - 2.14.1
+        - 2.14.0
+        - 2.13.3
+        - Older (unsupported)
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Devices that reproduce the issue
+      placeholder: |
+        Example:
+        * Pixel 4 running Android 12
+        * Samsung S21 running Android 11
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Devices that do not reproduce the issue
+      placeholder: |
+        Example:
+        * Pixel 3 running Android Pie
+  - type: dropdown
+    attributes:
+      label: Reproducible in the demo app?
+      description: Please try and reproduce the issue in the [ExoPlayer demo app](https://exoplayer.dev/demo-application.html).
+      options:
+        - "Yes"
+        - "No"
+        - Not tested
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Reproduction steps
+      description: Clear and complete steps we can use to reproduce the problem
+      placeholder: |
+        Example:
+        1. Play the attached media in the demo app
+        2. Seek forward 10s
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Expected result
+      placeholder: |
+        Example:
+        The media plays successfully
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Actual result
+      placeholder: |
+        Example:
+        Playback crashes with the following stack trace:
+        ...
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Media
+      description: |
+        Media we can use to reproduce the problem. Either:
+        * Attach a file here
+        * Include a media URL
+        * Refer to a piece of media from the demo app (e.g. `Misc > Dizzy (MP4)`)
+        * If you don't want to post media publicly please email the info to dev.exoplayer@gmail.com with subject 'Issue #\<issuenumber\>' after filing this issue, and note that you will do this here.
+        * If you are certain the issue does not depend on the media being played, enter "Not applicable" here.
+
+        For DRM-protected media please also include the scheme and license server URL.
+    validations:
+      required: true
+  - type: checkboxes
+    attributes:
+      label: Bug Report
+      description: |
+        After filing this issue please run `adb bugreport` shortly after reproducing the problem (ideally in the [demo app](https://exoplayer.dev/demo-application.html)) to capture a zip file, and email this to dev.exoplayer@gmail.com with subject 'Issue #\<issuenumber\>'.
+
+        **Note:** Logcat output is **not** the same as a full bug report, and is often missing information that's useful for diagnosing issues. Please ensure you're sending a full bug report zip file.
+      options:
+        - label: You will email the zip file produced by `adb bugreport` to dev.exoplayer@gmail.com after filing this issue.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false