chore: set explorer instance count to 3

[ebezzi]

Reviewers

Functional:
@atolopko-czi

Readability:

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Changes

• add
• remove
• modify

[codecov]

Codecov Report

Merging #259 (5e308dd) into main (1e9965a) will not change coverage.
The diff coverage is n/a.

❗ Current head 5e308dd differs from pull request most recent head 04cb2f5. Consider uploading reports for the commit 04cb2f5 to get more accurate results

@@           Coverage Diff           @@
##             main     #259   +/-   ##
=======================================
  Coverage   76.12%   76.12%           
=======================================
  Files          90       90           
  Lines        6660     6660           
=======================================
  Hits         5070     5070           
  Misses       1590     1590           

Flag	Coverage Δ
frontend	76.12% <ø> (ø)
javascript	76.12% <ø> (ø)
smokeTest	?
unitTest	76.12% <ø> (ø)

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