chore: update GH issue templates for Linear compatibility (#777)

Author: stephanie-anderson

.github/ISSUE_TEMPLATE/01-feature.yml

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+name: 💡 Feature Request
+description: Propose new functionality for the SDK
+labels: ["Rust", "Feature"]
+body:
+  - type: markdown
+    attributes:
+      value: Thanks for taking the time to file a feature request! Please fill out this form as completely as possible.
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem Statement
+      description: A clear and concise description of what you want and what your use case is.
+      placeholder: |-
+        I want to make whirled peas, but Sentry doesn't blend.
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Solution Brainstorm
+      description: We know you have bright ideas to share ... share away, friend.
+      placeholder: |-
+        Add a blender to Sentry.
+    validations:
+      required: true
+  - type: markdown
+    attributes:
+      value: |-
+        ## Thanks 🙏
+        Check our [triage docs](https://open.sentry.io/triage/) for what to expect next.

.github/ISSUE_TEMPLATE/02-improvement.yml

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+name: 💡 Improvement
+description: Propose an improvement for existing functionality of the SDK
+labels: ["Rust", "Improvement"]
+body:
+  - type: markdown
+    attributes:
+      value: Thanks for taking the time to file a request! Please fill out this form as completely as possible.
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem Statement
+      description: A clear and concise description of what you want and what your use case is.
+      placeholder: |-
+        I want to make whirled peas, but Sentry doesn't blend.
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Solution Brainstorm
+      description: We know you have bright ideas to share ... share away, friend.
+      placeholder: |-
+        Add a blender to Sentry.
+    validations:
+      required: true
+  - type: markdown
+    attributes:
+      value: |-
+        ## Thanks 🙏
+        Check our [triage docs](https://open.sentry.io/triage/) for what to expect next.

.github/ISSUE_TEMPLATE/03-bug.yml

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+name: 🐞 Bug Report
+description: Tell us about something that's not working the way we (probably) intend.
+labels: ["Rust", "Bug"]
+body:
+  - type: dropdown
+    id: type
+    attributes:
+      label: How do you use Sentry?
+      options:
+        - Sentry SaaS (sentry.io)
+        - Self-hosted / on-premises
+    validations:
+      required: true
+  - type: input
+    id: version
+    attributes:
+      label: SDK version
+      description: Which SDK version do you use?
+      placeholder: e.g. 4.9.2
+    validations:
+      required: true
+  - type: textarea
+    id: repro
+    attributes:
+      label: Steps to reproduce
+      description: How can we see what you're seeing? Specific is terrific.
+      placeholder: |-
+        1. What
+        2. you
+        3. did.
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected result
+    validations:
+      required: true
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual result
+      description: Logs? Screenshots? Yes, please.
+    validations:
+      required: true
+  - type: markdown
+    attributes:
+      value: |-
+        ## Thanks 🙏
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Support Request
+    url: https://sentry.io/support
+    about: Use our dedicated support channel for paid accounts.