Feat: add ability to set connection limit and other connection string params

[mipyykko]

When creating the Prisma client, we use our own prebuilt connection string with parameters that can be set by envs.

Added connection limits to helm configuration.

[codecov[bot]]

Codecov Report

Merging #1210 (a3a58eb) into master (4d665be) will decrease coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1210      +/-   ##
==========================================
- Coverage   64.19%   64.18%   -0.01%     
==========================================
  Files         124      124              
  Lines        5315     5314       -1     
  Branches     1234     1233       -1     
==========================================
- Hits         3412     3411       -1     
  Misses       1774     1774              
  Partials      129      129              

Flag	Coverage Δ
backend	64.18% <100.00%> (-0.01%)	:arrow_down:

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Impacted Files	Coverage Δ
backend/services/knex.ts	100.00% <ø> (ø)
backend/prisma/extensions.ts	56.94% <100.00%> (ø)
backend/prisma/index.ts	86.66% <100.00%> (ø)

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