Add ganache-core E2E test

[cgewecke]

Description

Adds ganache-core as an E2E published target. Their unit tests (~500) use a range of Web3's modules, esp. different provider packages. This might be a useful check to run against #3190 since there are many changes to the WS provider there. Ganache has uncovered provider bugs here in the past.

Temporarily removes the Truffle E2E tests from the Travis run because they are on 1.2.1 and unclear when they will upgrade. tsc errors prevent Truffle from installing newer Web3 (they had to rework their types a bit when they ran 1.2.2). #3274 added a large Buidler project test suite as a Truffle substitute as well.

Commit fa8eedf contains a proof that the published branch is being used to run the tests.

Type of change

• E2E test

Checklist:

• I have selected the correct base branch.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• Any dependent changes have been merged and published in downstream modules.
• I ran npm run dtslint with success and extended the tests and types if necessary.
• I ran npm run test:unit with success and extended the tests if necessary.
• I ran npm run build-all and tested the resulting file/'s from dist folder in a browser.
• I have updated the CHANGELOG.md file in the root folder.
• I have tested my code on the live network.

[coveralls]

Coverage remained the same at 84.922% when pulling ec86978 on test/e2e-ganache-core into 9b4b68a on 1.x.

[nivida]

LGTM! Could you create an issue to re-add the truffle tests later when they have updated truffle to the latest version? (just to be sure we do not forget about it)

[cgewecke]

@nivida - Issue added in #3308