fix(ci): allow to run all lighwalletd tests in Docker

[gustavovalverde]

Motivation

A LWD test was expecting the ZEBRA_TEST_LIGHTWALLETD to be set, but this variable is needed for all LWD tests and not specifically for lightwalletd_integration.

We had to rename this variable on a buggy elif statement in our Docker entrypoint.

This was avoiding most LWD tests to run correctly.

Solution

• Use $TEST_LWD_INTEGRATION to run lightwalletd_integration in our entrypoint and in CI
• Remove $ZEBRA_TEST_LIGHTWALLETD as this was an incorrect logic

Tests

• We must validate this tests are running correctly, by checking the logs directly in this PR

• The PR name will make sense to users.
• The PR provides a CHANGELOG summary.
• The solution is tested.
• The documentation is up to date.
• The PR has a priority label.

PR Reviewer's Checklist

• The PR Author's checklist is complete.
• The PR resolves the issue.

[gustavovalverde]

@mergify queue

[mergify]

queue

✅ The pull request has been merged automatically

The pull request has been merged automatically at 3983428

[gustavovalverde]

The lightwalletd_wallet_grpc_tests are failing in this PR, but that's a different issue. Let's merge this one so we can continue the Rust fix in another one https://github.com/ZcashFoundation/zebra/actions/runs/11895020195/job/33189274878#step:15:721