fix: set default Content Type header to "binary/octet-stream"

[igor-lemon]

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New Pull Request Checklist

I can't download a file with ext *.data. The parse server return Content-Type: null I would to have a default type Content-Type: binary/octet-stream

• [x] I am not disclosing a vulnerability.
• [x] I am creating this PR in reference to an issue.

Issue Description

Related issue: #7572

• [ ] Add test cases
• [ ] Add entry to changelog
• [ ] Add changes to documentation (guides, repository pages, in-code descriptions)
• [ ] Add security check
• [ ] Add new Parse Error codes to Parse JS SDK
• [ ] ...

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[igor-lemon]

I think it should be a more pretty solution than add Content-Disposition header as I did in the prev PR #7571

[parse-github-assistant[bot]]

I will reformat the title to use the proper commit message syntax.

[codecov[bot]]

Codecov Report

Merging #7603 (25d1dc5) into master (fdb7dfb) will increase coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #7603      +/-   ##
==========================================
+ Coverage   93.94%   93.97%   +0.03%     
==========================================
  Files         181      181              
  Lines       13279    13354      +75     
==========================================
+ Hits        12475    12550      +75     
  Misses        804      804              

Impacted Files	Coverage Δ
src/Routers/FilesRouter.js	88.54% <100.00%> (ø)
src/batch.js	91.37% <0.00%> (-1.73%)	:arrow_down:
src/Adapters/Files/GridFSBucketAdapter.js	79.50% <0.00%> (-0.82%)	:arrow_down:
src/RestWrite.js	94.04% <0.00%> (-0.07%)	:arrow_down:
src/Options/Definitions.js	100.00% <0.00%> (ø)
src/GraphQL/loaders/functionsMutations.js	100.00% <0.00%> (ø)
src/GraphQL/loaders/parseClassMutations.js	100.00% <0.00%> (ø)
src/cloud-code/Parse.Cloud.js	99.20% <0.00%> (+<0.01%)	:arrow_up:
src/GraphQL/loaders/parseClassQueries.js	98.03% <0.00%> (+0.03%)	:arrow_up:
src/Config.js	93.39% <0.00%> (+0.08%)	:arrow_up:
... and 11 more

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[santiagoprieto]

Did this ever get pushed to a live version? Seems to make sense.

[mtrezza]

@santiagoprieto See https://github.com/parse-community/parse-server/issues/7572