[Action Connectors] make ibm and service now svg icons bigger

[mgiota]

📝 Summary

As part of this PR we spotted some issues with a few svg icons regarding Actions Connectors. There are a few icons that appear to be smaller than others. These icons look smaller in following places:

• Observability Rule Details page

• Wherever Edit Rule Flyout appears (o11y Rule pages, Rules and connectors and respective o11y apps from Alerts and Rules header menu)

  O11y rule pages

Edit Rule Flyout

Here's the list of icons I identified that need to be fixed:

• IBM resilient
• Service Now

Note: Above screenshot which shows the list of action connectors looks fine in the Rule flyout. I just tuned it a bit to be able to identify the small logos.

Acceptance criteria

• Provide a new svg for IBM
• Provide a new svg for Service Now
• Provide a new svg for any other icon you think might needs to be tuned. No need to provide any new svg for xmatters, since it is already fixed in this PR

cc @katrin-freihofner @fkanout @gmmorris

[elasticmachine]

Pinging @elastic/response-ops (Team:ResponseOps)