Update project-template.md to align with project-management.md (#2583)

* Update project-template.md to align with project-management.md

This change aligns the "required staffing" section in the project template with what we have documented in the project management guidelines. It allows GC and TC to delegate sponsorship of projects.

* PR comments

Co-authored-by: Pablo Baeyens <[email protected]>

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Co-authored-by: Pablo Baeyens <[email protected]>

project-template.md

@@ -28,7 +28,7 @@ Who (people, companies) in the industry should be aware of this effort? Was ther
 
 Projects cannot be started until the following participants have been identified:
 * Every project needs a project lead, who is willing to bottom line the project and address any issues which are not handled by other project members.
-* At least two sponsoring [TC](community-members.md#technical-committee) or [GC](community-members.md#governance-committee) members (or [semantic convention maintainers](https://github.com/orgs/open-telemetry/teams/specs-semconv-maintainers) in the case of semantic convention SIGs). Sponsors are dedicated to attending meetings, reviewing proposals, and in general being aware of the state of the project and its technical details. Sponsors guide the project through the spec process, keep the tracking issue up to date, and help to ensure that relevant community members provide input at the appropriate times.
+* At least two sponsoring [TC](community-members.md#technical-committee) or [GC](community-members.md#governance-committee) members (or [semantic convention maintainers](https://github.com/orgs/open-telemetry/teams/specs-semconv-maintainers) in the case of semantic convention SIGs), or community members delegated by them. Sponsors are dedicated to attending meetings, reviewing proposals, and in general being aware of the state of the project and its technical details. Sponsors guide the project through the spec process, keep the tracking issue up to date, and help to ensure that relevant community members provide input at the appropriate times.
 * A GC liaison to facilitate this SIG's health and ensure project scope remains true to the project description. If a GC member is also a sponsor for this project, they are by default the GC liaison (see [GC check-ins](./gc-check-ins.md)).
 * Engineers willing to write prototypes in at least two languages (if relevant to project). Languages should be fairly different from each other (for example: Java and Python).
 * Maintainers or approvers from those languages committed to reviewing the prototypes.