[G2M] fix - Deleting a project should not delete all stages and their KVs under a team

[ashishjullia]

Problem:
Because of

portunus-worker/modules/projects.js

Line 54 in e76eda8

const stageKeys = await STAGES.list({ prefix: `${team}::` });

, this

portunus-worker/modules/projects.js

Line 68 in e76eda8

return Promise.all([STAGES.delete(name), KV.delete(name)]);

will delete all stages and their KVs under a team

Fix:
Updated updateProjectName to handle project key's actual value update for an update project name and then for deleteProject's bug only delete those stages and KVs and not all