Log output on failures in helm library

[akankshakumari393]

Change Overview

This PR is to add an output log to the helm install function in case of failure.

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

• https://kasten.atlassian.net/browse/K10-7200

Test Plan

• 💪 Manual
• ⚡ Unit test
• 💚 E2E

A scenario where helm install would fail and output error log as well. Here helm install would fail because Kafka helm chart was already installed.
./build/integration-test.sh Kafka

Running integration tests:
~/KASTEN/kanister/pkg/testing ~/KASTEN/kanister
=== RUN   Test
INFO[2021-05-24T14:27:36.371277091+05:30] Running e2e integration test.                 File=reflect/value.go Function=reflect.Value.call Line=476 app=kafka testName=Kafka.TestRun
INFO[2021-05-24T14:27:36.435835746+05:30] Adding repo.                                  File=pkg/app/kafka.go Function="github.com/kanisterio/kanister/pkg/app.(*KafkaCluster).Install" Line=119 app=kafka
INFO[2021-05-24T14:27:40.196822748+05:30] Installing kafka operator using helm.         File=pkg/app/kafka.go Function="github.com/kanisterio/kanister/pkg/app.(*KafkaCluster).Install" Line=124 app=kafka
ERRO[2021-05-24T14:27:42.68865936+05:30] Error installing helm chart                   File=pkg/app/kafka.go Function="github.com/kanisterio/kanister/pkg/app.(*KafkaCluster).Install" Line=125 output="Error: rendered manifests contain a resource that already exists. Unable to continue with install: ClusterRole \"strimzi-cluster-operator-namespaced\" in namespace \"\" exists and cannot be imported into the current release: invalid ownership metadata; annotation validation error: key \"meta.helm.sh/release-name\" must equal \"kafka-65g5f\": current value is \"kafka-q4w87\""
----------------------------------------------------------------------
FAIL: <autogenerated>:1: Kafka.TestRun
integration_test.go:188:
    c.Assert(err, IsNil)
... value *errors.withStack = Error installing operator kafka through helm.: exit status 1 ("Error installing operator kafka through helm.: exit status 1")

[PrasadG193]

Looks good