Correctly prints the size of the chunk during the build statistic print

[EmaGht]

This commits allows the cli to correctly print the sum of the sizes of the assets of a given chunk instead of the size of the first emitted asset

Attached:
-Before.PNG: What was happening before the fix in my local environment
-After.PNG: What's happening after the fix, notice that now the size of the "main-client" is the actual sum of the sizes of main-client.js and initial.css
-webpack.config.js: As requested, my current webpack configuration. This problem happens when i'm using the MiniCssExtractPlugin to extract my initial.css together with the main client

Before.PNG

After.PNG

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[EmaGht]

@googlebot I signed it!

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[clydin]

Source map files (those that end in .map) should be excluded from the total size.

Can you also update the commit message so that it starts with:
fix(@angular-devkit/build-angular):

[EmaGht]

refactored the accumulation function and excluded .map files!

[clydin]

Can you squash the commits?
Otherwise, I think this looks good.

[alan-agius4]

Can you please also reference #16627 in the commit footer?

Ex:

Fixes: #16627 

[EmaGht]

@clydin First time squashing, hopefully everything went according to plan 👍
@alan-agius4 done!

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