[FE-10764] Make test host and credentials configurable

[israelvicars]

Tests can be ran against hosts other than https://metis.mapd.com:443 with custom credentials.

PROTOCOL, HOSTNAME, PORT, USERNAME, PASSWORD, and DATABASE are optional variables that can be used when running the integration tests or example files to use other hosts and crederntials. The default values correspond with the original metis host values and credentials.

Tests have been updated to check for dashboard and table existence instead of the precise values.

The above changes were verified running the updated tests against Metis and Forge.

Merge Checklist

🔧 Issue(s) fixed:

• Author referenced issue(s) fixed by this PR: FE-10764

🚬 Smoke Test

• Works in chrome
• Works in firefox
• Works in safari
• Works in ie edge
• Works in ie 11

🚢 Merge

• author crafted PR's title into release-worthy commit message.

[jonvuri]

Confirmed by running against a different server that happened to have the same credentials and the necessary tables. Should we make the database name and credentials configurable too so that's not necessary? These are no longer the default credentials for new installs, after all.

[israelvicars]

Testing note: node tests had mixed results on some runs, diagnosed as server response latency and unrelated to this issue. Please reach out if testing results are inconsistent.