add script and doc for cherry_pick_pull

[carlory]

What type of PR is this?

/kind documentation
/kind feature

What this PR does / why we need it:

As release-1.0 published, we need a script to backport some PRs from master to release branches.

Does this PR introduce a user-facing change?:

add a script and document for cherry-pick pull

[carlory]

➜  karmada git:(script-cherry-pick-pull) ./hack/cherry_pick_pull.sh
./hack/cherry_pick_pull.sh <remote branch> <pr-number>...: cherry pick one or more <pr> onto <remote branch> and leave instructions for proposing pull request

  Checks out <remote branch> and handles the cherry-pick of <pr> (possibly multiple) for you.
  Examples:
    ./hack/cherry_pick_pull.sh upstream/release-3.14 12345        # Cherry-picks PR 12345 onto upstream/release-3.14 and proposes that as a PR.
    ./hack/cherry_pick_pull.sh upstream/release-3.14 12345 56789  # Cherry-picks PR 12345, then 56789 and proposes the combination as a single PR.

  Set the DRY_RUN environment var to skip git push and creating PR.
  This is useful for creating patches to a release branch without making a PR.
  When DRY_RUN is set the script will leave you in a branch containing the commits you cherry-picked.

  Set UPSTREAM_REMOTE (default: upstream) and FORK_REMOTE (default: origin)
  to override the default remote names to what you have locally.

  For merge process info, see https://github.com/karmada-io/karmada/blob/master/docs/userguide/cherry-picks.md

➜  karmada git:(script-cherry-pick-pull) DRY_RUN=true ./hack/cherry_pick_pull.sh upstream/release-1.0 1206
You are not logged into any GitHub hosts. Run gh auth login to authenticate.

➜  karmada git:(script-cherry-pick-pull) gh auth login
? What account do you want to log into? GitHub.com
? What is your preferred protocol for Git operations? HTTPS
? Authenticate Git with your GitHub credentials? Yes
? How would you like to authenticate GitHub CLI? Paste an authentication token
Tip: you can generate a Personal Access Token here https://github.com/settings/tokens
The minimum required scopes are 'repo', 'read:org', 'workflow'.
? Paste your authentication token: ****************************************
- gh config set -h github.com git_protocol https
✓ Configured git protocol
✓ Logged in as carlory

➜  karmada git:(script-cherry-pick-pull) ./hack/cherry_pick_pull.sh upstream/release-1.0 1206
github.com
  ✓ Logged in to github.com as carlory (/Users/dijun/.config/gh/hosts.yml)
  ✓ Git operations for github.com configured to use https protocol.
  ✓ Token: *******************

+++ Updating remotes...
Fetching upstream
Fetching origin
+++ Creating local branch automated-cherry-pick-of-#1206-upstream-release-1.0-1641377057
Branch 'automated-cherry-pick-of-#1206-upstream-release-1.0-1641377057' set up to track remote branch 'release-1.0' from 'upstream'.
Switched to a new branch 'automated-cherry-pick-of-#1206-upstream-release-1.0-1641377057'
+++ Downloading patch to /tmp/1206.patch (in case you need to do this again)

+++ About to attempt cherry pick of PR. To reattempt:
  $ git am -3 /tmp/1206.patch

Applying: remove unreachable code

+++ I'm about to do the following to push to GitHub (and I'm assuming origin is your personal fork):

  git push origin automated-cherry-pick-of-#1206-upstream-release-1.0-1641377057:automated-cherry-pick-of-#1206-upstream-release-1.0

+++ Proceed (anything but 'y' aborts the cherry-pick)? [y/n] y
Enumerating objects: 11, done.
Counting objects: 100% (11/11), done.
Delta compression using up to 4 threads
Compressing objects: 100% (5/5), done.
Writing objects: 100% (6/6), 515 bytes | 515.00 KiB/s, done.
Total 6 (delta 4), reused 0 (delta 0), pack-reused 0
remote: Resolving deltas: 100% (4/4), completed with 4 local objects.
remote:
remote: Create a pull request for 'automated-cherry-pick-of-#1206-upstream-release-1.0' on GitHub by visiting:
remote:      https://github.com/carlory/karmada/pull/new/automated-cherry-pick-of-%231206-upstream-release-1.0
remote:
To https://github.com/carlory/karmada.git
 * [new branch]        automated-cherry-pick-of-#1206-upstream-release-1.0-1641377057 -> automated-cherry-pick-of-#1206-upstream-release-1.0

+++ Creating a pull request on GitHub at carlory:automated-cherry-pick-of-#1206-upstream-release-1.0

Creating pull request for carlory:automated-cherry-pick-of-#1206-upstream-release-1.0 into release-1.0 in karmada-io/karmada

https://github.com/karmada-io/karmada/pull/1217

+++ Returning you to the script-cherry-pick-pull branch and cleaning up.

[carlory]

#1217 is created by the hack/cherry_pick_pull.sh script

[carlory]

/cc @RainbowMango @kevin-wangzefeng

[RainbowMango]

Thanks @carlory .

[carlory]

/cc @RainbowMango

[RainbowMango]

/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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