Backport Github issue and PR templates

.github/ISSUE_TEMPLATE/BC_Break.md

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+---
+name: 💥 BC Break
+about: Have you encountered an issue during upgrade? 💣
+---
+
+<!--
+Before reporting a BC break, please consult the upgrading document to make sure it's not an expected change: https://github.com/doctrine/orm/blob/2.9.x/UPGRADE.md
+-->
+
+### BC Break Report
+
+<!-- Fill in the relevant information below to help triage your issue. -->
+
+|    Q        |   A
+|------------ | ------
+| BC Break    | yes
+| Version     | x.y.z
+
+#### Summary
+
+<!-- Provide a summary describing the problem you are experiencing. -->
+
+#### Previous behavior
+
+<!-- What was the previous (working) behavior? -->
+
+#### Current behavior
+
+<!-- What is the current (broken) behavior? -->
+
+#### How to reproduce
+
+<!--
+Provide steps to reproduce the BC break.
+If possible, also add a code snippet with relevant configuration, entity mappings, DQL etc.
+Adding a failing Unit or Functional Test would help us a lot - you can submit it in a Pull Request separately, referencing this bug report.
+-->

.github/ISSUE_TEMPLATE/Bug.md

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+---
+name: 🐞 Bug Report
+about: Something is broken? 🔨
+---
+
+### Bug Report
+
+<!-- Fill in the relevant information below to help triage your issue. -->
+
+|    Q        |   A
+|------------ | ------
+| BC Break    | yes/no
+| Version     | x.y.z
+
+#### Summary
+
+<!-- Provide a summary describing the problem you are experiencing. -->
+
+#### Current behavior
+
+<!-- What is the current (buggy) behavior? -->
+
+#### How to reproduce
+
+<!--
+Provide steps to reproduce the bug.
+If possible, also add a code snippet with relevant configuration, entity mappings, DQL etc.
+Adding a failing Unit or Functional Test would help us a lot - you can submit one in a Pull Request separately, referencing this bug report.
+-->
+
+#### Expected behavior
+
+<!-- What was the expected (correct) behavior? -->
+

.github/ISSUE_TEMPLATE/Feature_Request.md

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+---
+name: 🎉 Feature Request
+about: You have a neat idea that should be implemented? 🎩
+---
+
+### Feature Request
+
+<!-- Fill in the relevant information below to help triage your issue. -->
+
+|    Q        |   A
+|------------ | ------
+| New Feature | yes
+| RFC         | yes/no
+| BC Break    | yes/no
+
+#### Summary
+
+<!-- Provide a summary of the feature you would like to see implemented. -->

.github/ISSUE_TEMPLATE/Support_Question.md

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+---
+name: ❓ Support Question
+about: Have a problem that you can't figure out? 🤔
+---
+
+<!-- Fill in the relevant information below to help triage your issue. -->
+
+|    Q        |   A
+|------------ | -----
+| Version     | x.y.z
+
+<!--
+Before asking question here, please try asking on Gitter or Slack first.
+Find out more about Doctrine support channels here: https://www.doctrine-project.org/community/
+Keep in mind that GitHub is primarily an issue tracker.
+-->
+
+### Support Question
+
+<!-- Describe the issue you are facing here. -->

.github/PULL_REQUEST_TEMPLATE/Failing_Test.md

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+---
+name: 🐞 Failing Test
+about: You found a bug and have a failing Unit or Functional test? 🔨
+---
+
+### Failing Test
+
+<!-- Fill in the relevant information below to help triage your issue. -->
+
+|    Q        |   A
+|------------ | ------
+| BC Break    | yes/no
+| Version     | x.y.z
+
+
+#### Summary
+
+<!-- Provide a summary of the failing scenario. -->
+

.github/PULL_REQUEST_TEMPLATE/Improvement.md

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+---
+name: ⚙ Improvement
+about: You have some improvement to make Doctrine better? 🎁
+---
+
+### Improvement
+
+<!-- Fill in the relevant information below to help triage your issue. -->
+
+|    Q        |   A
+|------------ | ------
+| New Feature | yes
+| RFC         | yes/no
+| BC Break    | yes/no
+
+#### Summary
+
+<!-- Provide a summary of the improvement you are submitting. -->

.github/PULL_REQUEST_TEMPLATE/New_Feature.md

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+---
+name: 🎉 New Feature
+about: You have implemented some neat idea that you want to make part of Doctrine? 🎩
+---
+
+<!--
+Thank you for submitting new feature!
+Pick the target branch based according to these criteria:
+  * submitting a bugfix: target the lowest active stable branch: 2.9.x
+  * submitting a new feature: target the next minor branch: 2.10.x
+  * submitting a BC-breaking change: target the next major branch: 3.0.x
+-->
+
+### New Feature
+
+<!-- Fill in the relevant information below to help triage your issue. -->
+
+|    Q        |   A
+|------------ | ------
+| New Feature | yes
+| RFC         | yes/no
+| BC Break    | yes/no
+
+#### Summary
+
+<!-- Provide a summary of the feature you have implemented. -->