Handle multiple backends for the TypeInstance

Description

Changes proposed in this pull request:

Argo action in case of the artifact:
```
value: 
key: test
backend:
context:
    (...)
```
will create an appropriate TypeInstance object and create a mutation.
modify Helm and Terraform runner to add value to output,
modify Jinja with the new configuration field: strip-value: true,
modify merger to remove value if exists in the artifacts.

Testing

Mattermost installation

Check out this branch.
Create a cluster with make dev-cluster

Set manifest location to my fork

kubectl set env deploy/capact-hub-public -n capact-system -c hub-public-populator MANIFESTS_SOURCES="github.com/mkuziemko/hub-manifests?ref=context_handling"

Wait until the manifests are populated

Use port-foward for capact-gateway :

kubectl port-forward svc/capact-gateway 8080:80 -n capt-system

Create parameters for Mattermost installation:

cat <<EOF > /tmp/mattermost-install.yaml
input-parameters:
host: mattermost.capact.local
EOF

Create action

capact action create --name mattermost-install cap.interface.productivity.mattermost.install --parameters-from-file /tmp/mattermost-install.yaml

Use capact act run mattermost-install and capact act watch mattermost-install to observe the status of the running action.
When it is finished, you can delete the action using capact act delete mattermost-install and helm charts.

PostgreSQL installation

Prepare inputs for PostgreSQL:

cat <<EOF > /tmp/postgresql-install.yaml
input-parameters:
superuser:
    username: "username"
    password: "password"
defaultDBName: "default_db"
EOF

Create the action:

capact action create --name test-1 cap.interface.database.postgresql.install --parameters-from-file /tmp/postgresql-install.yaml

Run and watch the action:

capact act run test-1
capact act watch test-1

Run integration tests

Currently, the tests are failing due to a lack of storage backend integration. It will be fixed by: https://github.com/capactio/capact/pull/655

Note: No longer valid. The PR was merged and this branch was updated. We can run tests by simple: make test-integration

Install secret storage backend:

helm install dotenv -n capact-system ./deploy/kubernetes/charts/secret-storage-backend --set=global.containerRegistry.path="ghcr.io/capactio/pr" --set=global.containerRegistry.overrideTag="PR-653" --set=supportedProviders={aws_secretsmanager,dotenv} --wait

Comment out line from e2e_suite_test.go:
```
waitTillServiceEndpointsAreReady()
```

Create envs for test:

export STATUS_ENDPOINTS="not-needed"
export GATEWAY_USERNAME="graphql"
export GATEWAY_PASSWORD="t0p_s3cr3t"
export GATEWAY_ENDPOINT="https://gateway.capact.local/graphql"

Run new scenario:

ginkgo -tags="integration" -v --focus="should propagate context provider to storage backend" ./test/e2e/...
ginkgo -tags="integration" -v --focus="should fail due to incorrect storage provider" ./test/e2e/...

Related issue(s)

https://github.com/capactio/capact/issues/634

capactio / capact