Enhance blueprint validator to check for duplicate phase names

[viveksinghggits]

Change Overview

Fixes #1463

Pull request type

Please check the type of change your PR introduces:

• 🚧 Work in Progress
• 🌈 Refactoring (no functional changes, no api changes)
• 🐹 Trivial/Minor
• 🐛 Bugfix
• 🌻 Feature
• 🗺️ Documentation
• 🤖 Test

Issues

• Phases' names should also be checked while validating blueprint #1463

Test Plan

• 💪 Manual
• ⚡ Unit test
• 💚 E2E

kanister/pkg/blueprint/validate (bp-name-validate*) » go test
Failed the 'validation of phase 00 in action backup' check.. ❌
Passed the 'validation of phase 10 in action backup' check.. ✅
Passed the 'validation of phase 11 in action backup' check.. ✅
Failed the 'validation of action backup' check.. ❌
Passed the 'validation of phase 30 in action backup' check.. ✅
Failed the 'validation of phase 40 in action backup' check.. ❌
Failed the 'validation of phase 51 in action backup' check.. ❌
Failed the 'validation of phase 61 in action backup' check.. ❌
Passed the 'validation of phase 71 in action backup' check.. ✅
Passed the 'validation of phase 70 in action backup' check.. ✅
{"FallbackVersion":"v0.0.0","File":"pkg/phase.go","Function":"PrepareData","Line":143,"PreferredVersion":"v0.0.1","level":"info","msg":"Falling back to default version of the function","time":"2022-06-09T16:57:40.823230059+02:00"}
Passed the 'validation of phase 00 in action backup' check.. ✅
Passed the 'validation of phase 01 in action backup' check.. ✅
{"FallbackVersion":"v0.0.0","File":"pkg/phase.go","Function":"PrepareData","Line":143,"PreferredVersion":"v0.0.1","level":"info","msg":"Falling back to default version of the function","time":"2022-06-09T16:57:40.823277817+02:00"}
Failed the 'validation of phase 10 in action backup' check.. ❌
Passed the 'validation of phase 20 in action backup' check.. ✅
Failed the 'validation of phase 21 in action backup' check.. ❌
{"FallbackVersion":"v0.0.0","File":"pkg/phase.go","Function":"PrepareData","Line":143,"PreferredVersion":"v0.0.1","level":"info","msg":"Falling back to default version of the function","time":"2022-06-09T16:57:40.823315425+02:00"}
{"FallbackVersion":"v0.0.0","File":"pkg/phase.go","Function":"PrepareData","Line":143,"PreferredVersion":"v0.0.1","level":"info","msg":"Falling back to default version of the function","time":"2022-06-09T16:57:40.823326721+02:00"}
Passed the 'validation of phase 30 in action backup' check.. ✅
Passed the 'validation of phase 31 in action backup' check.. ✅
OK: 3 passed
PASS
ok  	github.com/kanisterio/kanister/pkg/blueprint/validate	0.020s

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[ihcsim]

LGTM 👍.