Convert ISSUES.md into a GitHub issue form

Replace the static ISSUES.md instructions with a structured GitHub issue
form so bug reports collect the needed details consistently. While
converting, fix the stale `chefspec/chefspec` repo link, replace the
deprecated `knife -v` with `chef --version`, drop the privacy-risky
"paste everything from env" field, and add a missing ChefSpec version
field.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Signed-off-by: Tim Smith <tsmith84@proton.me>

Author: tas50

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,94 @@
+name: Bug Report
+description: Report a problem with ChefSpec
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to report an issue with ChefSpec! Filling out
+        the fields below helps us reproduce and resolve your issue quickly.
+
+        Before opening a new issue, please search the
+        [existing issues](https://github.com/chef/chefspec/issues) to see if it
+        has already been reported.
+  - type: textarea
+    id: summary
+    attributes:
+      label: What are you trying to accomplish?
+      description: Describe what you were doing and what went wrong.
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Steps to reproduce
+      description: >-
+        A minimal, self-contained example that reproduces the problem (see
+        [SSCCE](http://sscce.org/)). Include the spec and any relevant recipe or
+        cookbook code.
+      render: ruby
+    validations:
+      required: true
+  - type: input
+    id: command
+    attributes:
+      label: Command run
+      placeholder: bundle exec rspec spec/unit/recipes/default_spec.rb
+    validations:
+      required: false
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behavior
+      description: What did you expect to happen?
+    validations:
+      required: true
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual behavior
+      description: What actually happened?
+    validations:
+      required: true
+  - type: textarea
+    id: backtrace
+    attributes:
+      label: Exception and backtrace
+      description: Paste the full error message and backtrace, if any.
+      render: text
+    validations:
+      required: false
+  - type: input
+    id: os
+    attributes:
+      label: Operating system and version
+    validations:
+      required: true
+  - type: input
+    id: chefspec-version
+    attributes:
+      label: ChefSpec version
+      description: The version of the `chefspec` gem you are using.
+    validations:
+      required: true
+  - type: input
+    id: chef-version
+    attributes:
+      label: Chef version
+      description: Output of `chef --version`.
+    validations:
+      required: true
+  - type: input
+    id: ruby-version
+    attributes:
+      label: Ruby version
+      description: Output of `ruby -v`.
+    validations:
+      required: true
+  - type: input
+    id: rubygems-version
+    attributes:
+      label: RubyGems version
+      description: Output of `gem -v`.
+    validations:
+      required: false