e2e: Group tests better for easy developer onboarding

[DeshErBojhaa]

We can consider running/exposing a subset of tests from the Makefile.

Upgrade e2e tests require extra setup in ibc-go-e2e-config.yaml. Which is not obvious for someone new to the repo. Also upgrade tests are excluded in the default CI workflow.

jobs:
  e2e:
    with:
      test-exclusions: 'TestUpgradeTestSuite,TestTransferTestSuite,TestAuthzTransferTestSuite,TestTransferTestSuiteSendReceive,TestTransferTestSuiteSendEnabled,TestTransferLocalhostTestSuite,TestConnectionTestSuite,TestInterchainAccountsGovTestSuite'

Given all this, we should figure out how to organize/grop tests for a better developer obboarding.

Possible considerations:

• More clear documentation
• More explicit fail msg
• New make command that only shows the functionality tests. And another make command that shows all tests.