Round down yearly plan savings %

[nalcalag]

Task/Issue URL: https://app.asana.com/1/137249556945/task/1211855463961045?focus=true

Description

Change rounding strategy from HALF_UP to ROUND_DOWN

Steps to test this PR

Pre steps

• Apply patch from https://app.asana.com/1/137249556945/project/1209991789468715/task/1210448620621729?focus=true

Upgrade

• Install from branch
• Purchase a test monthly subscription (Free Trial)
• Cancel and wait until Free Trial expires OR wait until free trial is renewed to a paid monthly subscription
• If expired after canceled, purchase a monthly subscription again
• Go to Subscription Settings
• Check Switch option is there with updated text "Switch to Yearly and Save 16%"
• Select Switch option
• Check copy for upgrade option is correct (16%)

Downgrade

• Switch to yearly
• Wait until screen refreshes
• Select switch option
• Check copy for downgrade option is correct (16%)

No UI changes

[nalcalag]

• Round down yearly plan savings % #7089 👈 (View in Graphite)
• develop

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[lmac012]

LGTM!