Driver Improvement: Tektronix AWG7000A

[ThorvaldLarsen]

Add features to Tektronix AWG:

1. Add function to clear current assets loaded on a given channel. Reloading sequences with same names and waveforms can lead to bugs in repetition numbers not being updated.
2. Add functionality for front panel All Output Off button to the driver. This allows remote control same as pressing button.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 67.55%. Comparing base (b457e02) to head (cb681c7).
Report is 5 commits behind head on main.

Files	Patch %	Lines
...c/qcodes/instrument_drivers/tektronix/AWG70000A.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5900   +/-   ##
=======================================
  Coverage   67.55%   67.55%           
=======================================
  Files         348      348           
  Lines       30260    30264    +4     
=======================================
+ Hits        20443    20446    +3     
- Misses       9817     9818    +1     

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[jenshnielsen]

@ThorvaldLarsen Could you add a newsfragment describing the change