Use Boolean instead of string for accepting the License agreement

[SalemWafi]

Description

Change the flag value --elv2-license "accept" to accept a boolean value instead of that; It would be like this --elv2-license true
This will make it more obvious for most end-users.

When that is implemented, these docs need to be updated with this change:

• https://www.apollographql.com/docs/rover/commands/supergraphs#federation-2-elv2-license
• https://www.apollographql.com/docs/rover/commands/dev#federation-2-elv2-license

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Related issue:
#1455

Related Code:
https://github.com/apollographql/rover/blob/6699487c2cae5493bb4ebd93a715a3d53b60ef0f/src/options/license.rs#L77C1-L83C2

[abernix]

Thanks for opening this issue. We chose accept initially because it satisfactory answers the question of "do you accept the license agreement of the ELv2 license". The answer true, doesn't satisfactorily answer that from a legal language perspective. Apologies, but this isn't something that is ever likely to change.