Rename activity to notifications

[lferran]

Description

Describe the proposed changes made in this PR.

How was this PR tested?

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4f6c442) 82.15% compared to head (6c4fd57) 82.15%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1713   +/-   ##
=======================================
  Coverage   82.15%   82.15%           
=======================================
  Files         334      334           
  Lines       19489    19489           
=======================================
  Hits        16011    16011           
  Misses       3478     3478           

Flag	Coverage Δ
ingest	69.25% <ø> (ø)
nucliadb	70.32% <100.00%> (ø)
reader	79.02% <100.00%> (ø)
sdk	40.46% <ø> (ø)
search	79.24% <ø> (ø)
standalone	88.27% <ø> (ø)
train	63.76% <ø> (ø)
utils	81.25% <ø> (ø)
writer	85.21% <ø> (ø)

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