modify welcome message

[BertrandGouny]

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[BertrandGouny]

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[BertrandGouny]

[jx-info] Hi, we've detected that the pipelines in this repository are using a syntax that will soon be deprecated.
We'll continue to update you through PRs as we progress. Please check #8589 for further information.

[BertrandGouny]

@BertrandGouny: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pr	48ca0c1	link	/test pr

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the jenkins-x/lighthouse repository. I understand the commands that are listed here.

[BertrandGouny]

/retest

[BertrandGouny]

@BertrandGouny: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pr	48ca0c1	link	/test pr

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the jenkins-x/lighthouse repository. I understand the commands that are listed here.