[charts/gateway] Moved affinity/tolerations/nodeselecter to Values.pmtagger

[ajbrink88]

Description of the change

Benefits

Drawbacks

Applicable issues

• fixes #

Additional information

Checklist

• [] Chart version bumped in Chart.yaml according to semver.
• [] Variables are documented in the README.md
• [X] Title of the PR starts with chart name (e.g. [charts/gateway])
• [X] If the chart contains a values-production.yaml apart from values.yaml, ensure that you implement the changes in both files

Added the changes as listed by @Gazza7205 in https://github.com/CAAPIM/apim-charts/pull/181