Deployment preparation: Balancer Registry Initializer V2

[EndymionJkb]

Deployment preparation: Balancer Registry Initializer V2

Build-info: balancer/balancer-v3-monorepo@193030c

Nothing has changed in the initializer contract code; just the inputs are different. Stable (and Surge) pools are updated to v2, and this version also adds the Gyro pools.

Note that the deployments README in master has a merge conflict marker; fixed in this PR.

Deployment preparation tasks checklist:

• Deployments README is updated with the new task name and link
• Task README has a description and links to the artifacts
• build-info is updated with artifacts compiled at the specified commit
• Artifacts are generated from build-info
• New task has a working fork test

Deprecating old tasks checklist:

• Old task was moved to deprecated/ directory
• Deployments README is updated: old task is moved to the 'deprecated' section, and links are updated with the deprecated/ prefix
• Old task fork test is skipped
• Old task README is updated with a warning sign, a link to the replacement task and a short description
• Addresses are rebuilt to reflect contract status

Code checklist:

• The diff is legible and has no extraneous changes
• Complex code has been commented in tests and scripts
• Fork test block number and test cases are appropriate for this deployment
• The base branch is either master, or there's a description of how to merge

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