Using epics7 env for rocky9 compatibility

[KaushikMalapati]

Description

motor-expert-screen was using epicsenv-3.14.12.sh, but the oldest version of epics base available on rocky9 is 7.0.2, so motor-expert-screen will use that environment from now on

I also had to update how :PN motors are opened, because originally they executed a file that tried to activate the epics 3.14 environment. Now I am directly opening the screen with edm and I added the path to EDMDATAFILES

Motivation and Context

https://jira.slac.stanford.edu/browse/ECS-6842

How Has This Been Tested?

Interactively

Where Has This Been Documented?

n/a

[ZLLentz]

I agree with this conceptually and I agree with the implementation
Let me double-check a few screen loads before/after on a hutch machine to make sure there aren't any obvious regressions

[ZLLentz]

This PR absolutely enables this script to be run from rocky9 hosts! Very good.

Here are the PV bases I'm planning to compare:

IMS: XPP:USR:MMS:01
PP: XPP:SB2:MMS:29
Newport: XPP:USR:MMN:01
AeroTech: XCS:SND:T1:Y1
SmarAct: XPP:MCS2:01:m1
Beckhoff (old): MFX:LJH:JET:X
Beckhoff (new): IM3L0:PPM:MMS

So far, the IMS was the exactly the same but the PP (old IMS) picked a slightly different screen (top is with the PR, bottom is before this PR):

I'll continue through the rest, it shouldn't take too long

[ZLLentz]

Everything was the same except for these super old pulse picker screens which are now using a less readable variant

[KaushikMalapati]

I will move the update EDMDATAFILES to use the old pcds_motionScreens directory. I assumed the newer version would just be better, but I guess not. Thanks for checking all this. Do you think there is anything else I should test?