added a top button because of file length (#8163)

Fixes # .

### Description

Added a top button because of file length as it improves readibility

A few sentences describing the changes proposed in this pull request.

### Types of changes
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] Non-breaking change (fix or new feature that would not break
existing functionality).
- [ ] Breaking change (fix or new feature that would cause existing
functionality to change).
- [ ] New tests added to cover the changes.
- [ ] Integration tests passed locally by running `./runtests.sh -f -u
--net --coverage`.
- [ ] Quick tests passed locally by running `./runtests.sh --quick
--unittests --disttests`.
- [ ] In-line docstrings updated.
- [ ] Documentation updated, tested `make html` command in the `docs/`
folder.

Signed-off-by: ANUSHKA KATHARE <anushkakathare07@gmail.com>
Co-authored-by: YunLiu <55491388+KumoLiu@users.noreply.github.com>

CONTRIBUTING.md

@@ -383,3 +383,8 @@ then make PRs to the `releasing/[version number]` to fix the bugs via the regula
 If any error occurs after the release process, first check out a new hotfix branch from the `main` branch,
 make a patch version release following the semantic versioning, for example, `releasing/0.1.1`.
 Make sure the `releasing/0.1.1` is merged back into both `dev` and `main` and all the test pipelines succeed.
+
+
+<p align="right">
+  <a href="#introduction">⬆️ Back to Top</a>
+</p>