Internal improvement: Move db integration test to truffle package

[eggplantzzz]

In order to remove a cyclic dependency in db (@truffle/db --> @truffle/migrate --> @truffle/db-loader --> @truffle/db) this PR moves and rewrites a db integration test and finds a new home for it in truffle.

This should retire #5600

[cds-amal]

Yay, an improved db test! Looks good to me!

[dongmingh]

I ran yarn test on packages/truffle and observed that the db test is executed successfully

    truffle db
bigint: Failed to load bindings, pure JS will be used (try npm run rebuild?)
bigint: Failed to load bindings, pure JS will be used (try npm run rebuild?)
      ✔ creates a project
      ✔ retrieves contract instances by project (82ms)
      ✔ retrieves saved compilations
      ✔ creates contract records
      ✔ loads contract sources
      ✔ loads bytecodes

However, there are dependency warning message:

$ yarn test
yarn run v1.22.11
warning package.json: "optionalDependencies" has dependency "@truffle/db" with range "^2.0.3" that collides with a dependency in "devDependencies" of the same name with version "^2.0.2"
$ ./scripts/test.sh
warning package.json: "optionalDependencies" has dependency "@truffle/db" with range "^2.0.3" that collides with a dependency in "devDependencies" of the same name with version "^2.0.2"
$ /Users/dongminghwang/work/trufflesuite/truffle/node_modules/.bin/semver -r '>=12' v16.15.0
16.15.0
warning package.json: "optionalDependencies" has dependency "@truffle/db" with range "^2.0.3" that collides with a dependency in "devDependencies" of the same name with version "^2.0.2"
$ yarn build:cli
warning package.json: "optionalDependencies" has dependency "@truffle/db" with range "^2.0.3" that collides with a dependency in "devDependencies" of the same name with version "^2.0.2"

[haltman-at]

Oh, looks like versions in package.json will have to be updated before merging.

[haltman-at]

Actually, I'm going to go ahead and hit request changes to make sure this doesn't get merged without the versions being fixed.

[dongmingh]

Re-test shows that the dependency issue is fixed. Thanks.
I like the idea of moving db integration test to truffle package.
The changes are good.

[cds-amal]

Tests pass, versions synced, looks good. I like it.

[haltman-at]

🎉