[integration] added example of DIRAC_NO_CFG into bashrc

[marianne013]

BEGINRELEASENOTES
*Core
CHANGE: Add an example for DIRAC_NO_CFG to bashrc.
ENDRELEASENOTES

[chaen]

Btw, it may be worth to add in the wiki a note about the run files on the servers that need updating. I am just not sure on which version it should be done.
I cooked up a one line command that will update the run files:

find -L /opt/dirac/startup/ -name run -exec sed -i.bak -E '/--cfg/! s| ((/[a-zA-Z_0-9]+)+\.cfg)| --cfg \1|g' {} \;

[chaen]

Also the component installer should be modified to add the --cfg https://github.com/DIRACGrid/DIRAC/blob/integration/FrameworkSystem/Client/ComponentInstaller.py#L1915
The fact that the tests in github action have not failed make me believe that we are not setting this DIRAC_DEPRECATED_FAIL where we should be doing it. I'll have a look at that

[chaen]

An attempt in #4690