Deployment preparation: Stable Pool V2

[EndymionJkb]

Deployment preparation: Stable Pool V2

Deploy V2 of the Stable Pool, which raises the amp factor limit and allows the swap fee manager to change the amp factor without governance intervention.

build-info: balancer/balancer-v3-monorepo@e1ae7f0

Note that the readme issue with the Cow Fee Burner in the wrong place is addressed in PR #210.

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 imports in index.ts, input.ts and fork tests are updated
• Old task README is updated with a warning sign, a link to the replacement task and a short description

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

Issue Resolution

Closes #184