Added servicing PR template to simplify the process of preparing patches (#28990)

Added servicing PR template

.github/PULL_REQUEST_TEMPLATE/servicing.md

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+## Description
+
+
+
+## Customer Impact
+
+
+
+## Regression?
+- [ ] Yes
+- [ ] No
+
+[If yes, specify the version the behavior has regressed from]
+
+## Risk
+- [ ] High
+- [ ] Medium
+- [ ] Low
+
+[Justify the selection above]
+
+## Verification
+- [ ] Manual (required)
+- [ ] Automated
+
+## Packaging changes reviewed?
+- [ ] Yes
+- [ ] No
+- [ ] N/A
+
+
+Addresses [issue number]