[BUGFIX LTS] Allow class-based helpers in strict-mode

[gabrielcsapo]

Summary

Backports the fix to #19877 (originally submitted in #19878) to work under 3.28.

Bug

Using class based helpers in strict mode results in the following in 3.28

TypeError: Cannot read properties of undefined (reading 'prototype')
                at ClassicHelperManager.getDebugName (http://localhost:7357/i18n-dummy/assets/vendor.js:7334:55)
                at http://localhost:7357/i18n-dummy/assets/vendor.js:40951:146
                at Object.evaluate (http://localhost:7357/i18n-dummy/assets/vendor.js:46402:17)
                at AppendOpcodes.evaluate (http://localhost:7357/i18n-dummy/assets/vendor.js:45783:19)
                at LowLevelVM.evaluateSyscall (http://localhost:7357/i18n-dummy/assets/vendor.js:48994:22)
                at LowLevelVM.evaluateInner (http://localhost:7357/i18n-dummy/assets/vendor.js:48965:14)
                at LowLevelVM.evaluateOuter (http://localhost:7357/i18n-dummy/assets/vendor.js:48958:14)
                at VM.next (http://localhost:7357/i18n-dummy/assets/vendor.js:49789:24)
                at VM._execute (http://localhost:7357/i18n-dummy/assets/vendor.js:49776:23)
                at VM.execute (http://localhost:7357/i18n-dummy/assets/vendor.js:49751:28)

[chadhietala]

FWIW I think this was supposed to be backported to the LTS (3.28 at the time) when it was fixed in #19878 as noted by @mixonic