set vue to a beta version for testing

[indirectlylit]

Summary

I had observed that computed props were not working as expected, and were not caching intermediary values. It appears that this is addressed in a recent risky upgrade to Vue

This PR upgrades to the beta so we can test it in develop for a while and watch out for issues. It also re-introduces some behaviors that were slow in the old code

Reviewer guidance

just sanity check that things work

References

https://github.com/vuejs/vue/releases/tag/v2.5.17-beta.0

Before 0.11.0 is released we need to upgrade to 2.5.17 final - see #4075

---

Contributor Checklist

• Contributor has fully tested the PR manually
• PR has the correct target branch and milestone
• PR has 'needs review' or 'work-in-progress' label
• If PR is ready for review, a reviewer has been added. (Don't use 'Assignees')
• If there are any front-end changes, before/after screenshots are included
• If this is an important user-facing change, PR or related issue has a 'changelog' label

Reviewer Checklist

• Automated test coverage is satisfactory
• Reviewer has fully tested the PR manually
• PR has been tested for accessibility regressions
• External dependencies files were updated (yarn and pip)
• Documentation is updated
• Link to diff of internal dependency change is included
• CHANGELOG.rst is updated for high-level changes
• Contributor is in AUTHORS.rst

[codecov]

Codecov Report

Merging #4065 into develop will increase coverage by <.01%.
The diff coverage is 62.5%.

@@             Coverage Diff             @@
##           develop    #4065      +/-   ##
===========================================
+ Coverage    50.19%   50.19%   +<.01%     
===========================================
  Files          634      634              
  Lines        21014    21013       -1     
  Branches      2714     2714              
===========================================
+ Hits         10547    10548       +1     
  Misses        9796     9796              
+ Partials       671      669       -2

Impacted Files	Coverage Δ
...olibri/core/assets/src/mixins/responsive-window.js	90% <62.5%> (+5.68%)	⬆️
...ts/src/views/ManageContentPage/ChannelListItem.vue	95.55% <0%> (-2.23%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f2c4cd8...355acf3. Read the comment docs.