Support more intuitive (Legally satisfactory) values for accepting the License agreement

[SalemWafi]

Update the flag value --elv2-license "accept" to accept also the values "yes"/"Yes"/"Y"/"y";
e.g. --elv2-license "yes"

This will provide more intuitive values for most end-users instead of just "accept".

Also, it will still be a satisfactory legal answer to the question, "Do you accept the license agreement of the ELv2 license?"

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 issues:

• rover supergraph compose command fails to prompt for license #1455

• Use Boolean instead of string for accepting the License agreement #2293

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