Add Red Hat Enterprise Linux and Rocky Linux installation instructions (#17423)

Added RHEL/Rocky install instructions (PyPI). Instructions cover
versions 8 and 9 which are the only supported ones - except for RHEL7
which is now on extended life cycle support phase.

Large part of the guide is for installing Python 3.11 or 3.12. RHEL8
ships with Python 3.6 and RHEL9 ships with 3.9. Newer Python versions
can be installed easily as they don't interfere with OS software that
still relies on the default Python version.

I was first planning to add prerequisites part to the prerequisites
section and then install instructions on the top of the page but that
section is for pre-built packages so it just didn't sound right. So I
just dumped everything to the PyPI section of the page. But suggestions
to change are welcome.

I also didn't combine these with Fedora section. I haven't tested those
packages on RHEL and Fedora ships with Python 3.12 out-of-box.
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Add Red Hat Enterprise Linux and Rocky Linux 8 and 9 installation instructions.

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@ -67,7 +67,7 @@ in Synapse can be deactivated.
**NOTE**: This has an impact on security and is for testing purposes only!
To deactivate the certificate validation, the following setting must be added to
your [homserver.yaml](../usage/configuration/homeserver_sample_config.md).
your [homeserver.yaml](../usage/configuration/homeserver_sample_config.md).
```yaml
use_insecure_ssl_client_just_for_testing_do_not_use: true

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@ -309,7 +309,62 @@ sudo dnf install libtiff-devel libjpeg-devel libzip-devel freetype-devel \
libwebp-devel libxml2-devel libxslt-devel libpq-devel \
python3-virtualenv libffi-devel openssl-devel python3-devel \
libicu-devel
sudo dnf groupinstall "Development Tools"
sudo dnf group install "Development Tools"
```
##### Red Hat Enterprise Linux / Rocky Linux
*Note: The term "RHEL" below refers to both Red Hat Enterprise Linux and Rocky Linux. The distributions are 1:1 binary compatible.*
It's recommended to use the latest Python versions.
RHEL 8 in particular ships with Python 3.6 by default which is EOL and therefore no longer supported by Synapse. RHEL 9 ship with Python 3.9 which is still supported by the Python core team as of this writing. However, newer Python versions provide significant performance improvements and they're available in official distributions' repositories. Therefore it's recommended to use them.
Python 3.11 and 3.12 are available for both RHEL 8 and 9.
These commands should be run as root user.
RHEL 8
```bash
# Enable PowerTools repository
dnf config-manager --set-enabled powertools
```
RHEL 9
```bash
# Enable CodeReady Linux Builder repository
crb enable
```
Install new version of Python. You only need one of these:
```bash
# Python 3.11
dnf install python3.11 python3.11-devel
```
```bash
# Python 3.12
dnf install python3.12 python3.12-devel
```
Finally, install common prerequisites
```bash
dnf install libicu libicu-devel libpq5 libpq5-devel lz4 pkgconf
dnf group install "Development Tools"
```
###### Using venv module instead of virtualenv command
It's recommended to use Python venv module directly rather than the virtualenv command.
* On RHEL 9, virtualenv is only available on [EPEL](https://docs.fedoraproject.org/en-US/epel/).
* On RHEL 8, virtualenv is based on Python 3.6. It does not support creating 3.11/3.12 virtual environments.
Here's an example of creating Python 3.12 virtual environment and installing Synapse from PyPI.
```bash
mkdir -p ~/synapse
# To use Python 3.11, simply use the command "python3.11" instead.
python3.12 -m venv ~/synapse/env
source ~/synapse/env/bin/activate
pip install --upgrade pip
pip install --upgrade setuptools
pip install matrix-synapse
```
##### macOS