Clarify raw data / archive download message

[edan-bainglass]

Change message to clarify that the waiting time is due to AiiDA creating the file, not the user's network.

Closes #1109

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 70.94%. Comparing base (5a32a7b) to head (41a083e).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
..._qe/app/result/components/summary/download_data.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1116   +/-   ##
=======================================
  Coverage   70.94%   70.94%           
=======================================
  Files         115      115           
  Lines        7158     7158           
=======================================
  Hits         5078     5078           
  Misses       2080     2080           

Flag	Coverage Δ
python-3.11	70.94% <0.00%> (ø)
python-3.9	70.93% <0.00%> (ø)

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[AndresOrtegaGuerrero]

LGTM