Remove the go toolchain line

[dereknola]

Proposed Changes

We introduced the go toolchain line in #11277, however this line causes issues with the GHA go install action and introduces another level of confusion.

Types of Changes

Verification

Everything is still green across CI and manual testing.

Testing

Linked Issues

User-Facing Change

Further Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.38%. Comparing base (b83f803) to head (8808c12).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11358      +/-   ##
==========================================
- Coverage   46.95%   42.38%   -4.57%     
==========================================
  Files         179      179              
  Lines       18600    18600              
==========================================
- Hits         8733     7883     -850     
- Misses       8512     9512    +1000     
+ Partials     1355     1205     -150     

Flag	Coverage Δ
e2etests	34.31% <ø> (-7.82%)	⬇️
inttests	18.82% <ø> (ø)
unittests	13.82% <ø> (ø)

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