Fix DATABASE_PASSWORD env for airbyte-metrics helm chart

[octavia-squidington-iii]

What

Resolves airbytehq/airbyte#23226

Currently the airbyte-metrics pod does not start up due to being unable to find the env. More info in the issue linked above, but I was able to get it to start normally with the change included in this PR.

Maybe this change was meant to be included in airbytehq/airbyte#16131?

How

This PR brings the airbyte-metrics deployment.yaml template in conformance with other charts pulling this secret.

a couple examples of the pattern used elsewhere that I've copied:

airbyte-platform/charts/airbyte-server/templates/deployment.yaml

Lines 77 to 81 in 15a34b8

	- name: DATABASE_PASSWORD
	valueFrom:
	secretKeyRef:
	name: {{ .Values.global.database.secretName | default (printf "%s-airbyte-secrets" .Release.Name ) }}
	key: {{ .Values.global.database.secretValue | default "DATABASE_PASSWORD" }}

airbyte-platform/charts/airbyte-temporal/templates/deployment.yaml

Lines 72 to 76 in 15a34b8

	- name: POSTGRES_PWD
	valueFrom:
	secretKeyRef:
	name: {{ .Values.global.database.secretName | default (printf "%s-airbyte-secrets" .Release.Name ) }}
	key: {{ .Values.global.database.secretValue | default "DATABASE_PASSWORD" }}

source: airbytehq/airbyte#23230

[octavia-squidington-iii]

@xpuska513 since you have added this change to other templates, I would appreciate your input and review 🙏🏽

source: airbytehq/airbyte#23230 (comment)

[github-actions]

Airbyte Code Coverage

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Total Project Coverage	26.89%	🍏

[sh4sh]

Also @davinchia would appreciate your review!

[davinchia]

Thanks @sh4sh ! This looks right to me.

I also want @xpuska513 to double check before we merge this in.

[xpuska513]

Looks good to me, AC tests passed so I think we can merge this in