Issue #3248975: Normalize the verbiage of "stage" vs. "staging area"

added 116 commits

• 149818a2...685ba03a - 115 commits from branch project:8.x-2.x
• c63a1125 - sample

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under the new idea I think the original is correct

changed this line in version 3 of the diff

added 2 commits

• f4a86801 - 1 commit from branch project:8.x-2.x
• f95b60e2 - area -> directory

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added 1 commit

• 46dcb781 - missed places

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added 6 commits

• 46dcb781...badd6080 - 3 commits from branch project:8.x-2.x
• 82c3d49e - area -> directory
• 4be4a4ea - missed places
• ae96e551 - replaced more instances

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added 1 commit

• a577223e - found 2 more, because of multiple line split

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added 6 commits

• 4b31d577 - 1 commit from branch project:8.x-2.x
• 2b7fd57b - area -> directory
• ce4011e3 - missed places
• 6148e5af - replaced more instances
• 8f4ef042 - found 2 more, because of multiple line split
• 4b31a680 - covering more cases

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added 1 commit

• 1a498b3f - remove changes to package_manager_bypass that inherit from composer_stager

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added 1 commit

• 3407dcdf - nit

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merged