Improve stale bot to check the reactions added to the stale bot comments before closing an issue

[psmyrek]

📝 Provide a description of the improvement

Currently, stale bot takes into account the following dates to decide whether the stale issue (or pull request) is not stale anymore:

• the creation date,
• the last date of editing an issue or pull request,
• the last date of adding a reaction to the body of issue or pull request,
• the last date of adding or editing a comment,
• the last date of changing a label.

It would be nice to take into account also the last date of adding a reaction to the bot's comments.

Adding a reaction to the bot's comment should unstale the issue (or pull request).

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If you'd like to see this improvement implemented, add a 👍 reaction to this post.

[Witoso]

First resolution, before we investigate, let's change the copy:

leave a comment or add a reaction under the issue description on the top of the thread.

[CKEditorBot]

There has been no activity on this issue for the past year. We've marked it as stale and will close it in 30 days. We understand it may still be relevant, so if you're interested in the solution, leave a comment or reaction under this issue.

[CKEditorBot]

We've closed your issue due to inactivity. We understand that the issue may still be relevant. If so, feel free to open a new one (and link this issue to it).