(ci) shorter application name

[thomasht86]

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HTTP 400 reason: Bad Request error_text: {"error-code":"BAD_REQUEST","message":"Invalid id 'pyvespa-int-vsearch-dev'. Tenant, application and instance names must start with a letter, may contain no more than 20 characters, and may only contain lowercase letters, digits or dashes, but no double-dashes."} for /application/v4/tenant/vespa-team/application/pyvespa-int-vsearch-dev/instance/default/deploy/dev-aws-us-east-1c