[2.4] Add timeout during prefix query

[ashtul]

This has been added to master in the contains/wildcard PRs. #2774 #2886

RED-81612

[MeirShpilraien]

Add timeout to union iterator.

[ashtul]

@MeirShpilraien , I will remove the union timeout from this PR for the 2.4 branch. The union timeout should go to the master branch first.

[codecov[bot]]

Codecov Report

Merging #2955 (fc7c6bd) into 2.4 (ccbe6fa) will decrease coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              2.4    #2955      +/-   ##
==========================================
- Coverage   81.82%   81.79%   -0.04%     
==========================================
  Files         179      179              
  Lines       28473    28478       +5     
==========================================
- Hits        23298    23293       -5     
- Misses       5175     5185      +10     

Impacted Files	Coverage Δ
src/query.c	90.85% <100.00%> (+0.05%)	:arrow_up:
src/fork_gc.c	57.14% <0.00%> (-1.30%)	:arrow_down:

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