api: Disallow asset progress from going back

[victorges]

What does this pull request do? Explain your changes. (required)

This disallows the progress displayed on asset objects to go back in time.

This avoids the potential confusion on the higher level asset objects. Notice that
the real progress and retry count are still available on the lower-level task objects,
for power-users that do want to display that in any UI.

Specific updates (required)

• Make sure to never make the asset progress smaller than before

How did you test each of these updates (required)
yarn test
staging check

Does this pull request close any open issues?
Fixes API-41

Checklist

• I have read the CONTRIBUTING document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.

[linear]

API-41 Prohibit asset progress to go back in %

When the processing status is updated for VOD, it jumps back and forth from 7% to 32% to 7%.

See the video from the user:

https://drive.google.com/file/d/1BzjJtdWAhfu87fYV5JtyoePhPtqS1sQN/view?usp=sharing

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
livepeer-studio	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 11, 2023 11:09pm

[codecov]

Codecov Report

Merging #1688 (0f3c9ad) into master (c1b73a7) will decrease coverage by 0.04325%.
The diff coverage is 40.00000%.

@@                 Coverage Diff                 @@
##              master       #1688         +/-   ##
===================================================
- Coverage   52.98203%   52.93878%   -0.04325%     
===================================================
  Files             74          74                 
  Lines           4896        4900          +4     
  Branches         970         972          +2     
===================================================
  Hits            2594        2594                 
- Misses          1969        1972          +3     
- Partials         333         334          +1     

Impacted Files	Coverage Δ
packages/api/src/controllers/task.ts	31.57895% <40.00000%> (+0.57120%)	⬆️

... and 1 file with indirect coverage changes

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Impacted Files	Coverage Δ
packages/api/src/controllers/task.ts	31.57895% <40.00000%> (+0.57120%)	⬆️

... and 1 file with indirect coverage changes

[adamsoffer]

LGTM 🚢