integration-tests: Build using single Dockerfile

[mslipper]

This PR updates the integration tests to build JS services using a single Dockerfile rather than multiple Dockerfiles that inherit from a builder image. This fixes the issues we've been seeing where the builder image on Docker Hub gets pulled instead of the locally-build one. The individual service to build is selected via the target attribute in docker-compose.yml.

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[codecov-commenter]

Codecov Report

Merging #1732 (2791549) into regenesis/0.5.0 (3f58aeb) will not change coverage.
The diff coverage is n/a.

❗ Current head 2791549 differs from pull request most recent head 1667185. Consider uploading reports for the commit 1667185 to get more accurate results

@@               Coverage Diff                @@
##           regenesis/0.5.0    #1732   +/-   ##
================================================
  Coverage            72.64%   72.64%           
================================================
  Files                   69       69           
  Lines                 2274     2274           
  Branches               337      337           
================================================
  Hits                  1652     1652           
  Misses                 622      622           

Flag	Coverage Δ
batch-submitter	61.56% <ø> (ø)
contracts	87.96% <ø> (ø)
core-utils	57.72% <ø> (ø)
data-transport-layer	38.23% <ø> (ø)
message-relayer	83.17% <ø> (ø)

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[tynes]

Should this also delete the now unused dockerfiles?

[tynes]

I have a similar change to gasPriceForL2 in #1736 which enforces fee payment on L2 meaning that 0 gas price transactions will fail. This was to add test coverage of the case where transactions are sent with a fee that is too small and is rejected at the policy layer by the sequencer

[mslipper]

Re: unused Dockerfiles - some of them are still used by the production release system, so I opted to leave them alone until after the regenesis. I can make a PR then that cleans everything up.