DOC: Add a note to the first interaction workflow about its nature

Add a note to the first interaction workflow about its automated nature,
and suggest that it may be some time before anyone comments on the issue
or pull request.

.github/workflows/first-interaction.yml

@@ -22,10 +22,16 @@ jobs:
 
           We are glad you are here and appreciate your contribution. Please keep in mind our [community participation guidelines](https://github.com/InsightSoftwareConsortium/ITK/blob/master/CODE_OF_CONDUCT.md). 📜
           Also, please check [existing open issues](https://github.com/InsightSoftwareConsortium/ITK/issues) and consider discussion on the [ITK Discourse](https://discourse.itk.org). 📖
+
+          This is an automatic message. Allow for time for the ITK community to be able to read the issue and comment on it.
+
         pr-message: |
           Thank you for contributing a pull request! 🙏
 
           **Welcome to the ITK community!** 🤗👋☀️
 
           We are glad you are here and appreciate your contribution. Please keep in mind our [community participation guidelines](https://github.com/InsightSoftwareConsortium/ITK/blob/master/CODE_OF_CONDUCT.md). 📜
           More support and guidance on the contribution process can be found in our [contributing guide](https://github.com/InsightSoftwareConsortium/ITK/blob/master/CONTRIBUTING.md). 📖
+
+          This is an automatic message. Allow for time for the ITK community to be able to read the pull request and comment
+          on it.