Fix interactive remove test on systems with dub installed

[wilzbach]

On my system and the Project-Tester the interactive remove test fails with 1.3.0:

Fetching dub 0.9.20...
Fetching dub 0.9.21...
Cannot remove package 'dub', there are multiple possibilities at location
'user'.
Available versions:
  1.3.0
  0.9.20
  0.9.21
Please specify a individual version using --version=... or use the wildcard --version=* to remove all versions.
Select version of 'dub' to remove from location 'user':1) 1.3.02) 0.9.203) 0.9.214) all versions> Removing dub in /home/seb/.dub/packages/dub-1.3.0/dub/Removed package: 'dub'Removed dub, version 1.3.0.
Failed to remove dub-0.9.20

Or on the Project Tester.

AFAICT for the changes to be propagated to the Project-Tester, a new tag will be required.

[wilzbach]

This is happening quite often now, e.g. https://ci.dlang.io/blue/organizations/jenkins/dlang-org%2Fdmd/detail/PR-6924/1/pipeline

[CyberShadow]

@MartinNowak @s-ludwig This is affecting all of @dlang development - as things are set up currently, whenever a test fails in Dub (or another project on the project tester), no DMD/Phobos/Druntime pull requests can be merged. Would it be possible to prioritize test suite fixes which affect the project tester?

[coveralls]

Coverage increased (+0.009%) to 61.646% when pulling 4535504 on wilzbach:fix-interactive-remove into 13581f8 on dlang:master.

[MartinNowak]

Think you're misinterpreting the test output, the first check is supposed to fail and the output you've cited comes from that (would make sense to 2>/dev/null that).
https://github.com/dlang/dub/pull/1157/files#diff-0d9bd8dbd24cf9eee031c3d7269f23ddR10
What's actually failing is something further down, most likely fetching 0.9.21.