Disable Percy (#11852)

* Disable Percy

While visual regression testing is without doubt an essential part of
quality assurance, the way we're currently using Percy brings little
to no value while causing mainenance overhead. Therefore, we're disabling it
until we have figure out https://github.com/vector-im/wat-internal/issues/36
and https://github.com/vector-im/wat-internal/issues/56.

* Also disable nightly build

* Comment out Percy step instead of fiddling with the output value

* Appease the frigging linter

README.md

@@ -2,7 +2,14 @@
 ![Tests](https://github.com/matrix-org/matrix-react-sdk/actions/workflows/tests.yml/badge.svg)
 ![Static Analysis](https://github.com/matrix-org/matrix-react-sdk/actions/workflows/static_analysis.yaml/badge.svg)
 [![matrix-react-sdk](https://img.shields.io/endpoint?url=https://dashboard.cypress.io/badge/simple/ppvnzg/develop&style=flat&logo=cypress)](https://dashboard.cypress.io/projects/ppvnzg/runs)
+
+<!--
+Percy is disabled while we're figuring out https://github.com/vector-im/wat-internal/issues/36
+and https://github.com/vector-im/wat-internal/issues/56. We're hoping to turn it back on or switch
+to an alternative in the future.
 [![This project is using Percy.io for visual regression testing.](https://percy.io/static/images/percy-badge.svg)](https://percy.io/dfde73bd/matrix-react-sdk)
+-->
+
 [![Localazy](https://img.shields.io/endpoint?url=https%3A%2F%2Fconnect.localazy.com%2Fstatus%2Felement-web%2Fdata%3Fcontent%3Dall%26title%3Dlocalazy%26logo%3Dtrue)](https://localazy.com/p/element-web)
 [![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=matrix-react-sdk&metric=alert_status)](https://sonarcloud.io/summary/new_code?id=matrix-react-sdk)
 [![Coverage](https://sonarcloud.io/api/project_badges/measure?project=matrix-react-sdk&metric=coverage)](https://sonarcloud.io/summary/new_code?id=matrix-react-sdk)