chore(package_xml): added autoware_ prefix to gnss_poser

[TaikiYamada4]

Description

Following the movement of adding autoware_ prefix to package names, this PR adds autoware prefix to gnss_poser.

Related links

Since this PR strongly relates to sensor launching systems, this PR must be merged together with the following PRs.

• https://github.com/autowarefoundation/autoware.universe/pull/8323
• https://github.com/autowarefoundation/sample_sensor_kit_launch/pull/100
• https://github.com/tier4/aip_launcher/pull/283
• https://github.com/autowarefoundation/awsim_labs_sensor_kit_launch/pull/4

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The PR author must check the checkboxes below when creating the PR.

• [x] I've confirmed the contribution guidelines.
• [x] The PR follows the pull request guidelines.

In-review checklist for the PR reviewers

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Post-review checklist for the PR author

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• [ ] There are no open discussions or they are tracked via tickets.

After all checkboxes are checked, anyone who has write access can merge the PR.

[SakodaShintaro]

@shmpwk Since the PR was merged on autoware.universe, can you also merge this one?